Relationship Between Friends in University.

Relationships between friends in university are too shallow, so it’s hard to make real friends. Our whole life is changing because of the lifestyle difference between university and high-school. University students are more free than before cause they are adults now. So all the things that we do and all the places that we go are totally changing. Because of these huge alterations, our relationships between friends are changed too. Relationships in university are more light and superficial than before. It's because of these several reasons. ("these several" sounds kind of awkward. I would just say "these reasons" or "several reasons.") First, in contrast to high school, university students don‘t have any fixed timetable, so the lunch time and relaxing time is all different between them. Therefore, students don‘t eat and relax together. Second, students are usually doing a part-time job or tutoring, so they spend less time on campus. (If someone "in university," that means that they attend college.) Even after all of their classes, they don‘t have time to hang out with each other ("get along" usually means that two people have a friendly relationship and they don't fight.)

To solve this problem, joining particular club activities that students are interested in could be a great solution. (I'll explain the difference between "that" and "which" below.) Through club activities they can find real friends who have similar interests (--------------------) Some will argue that it is impossible to make real friends in university because university is a microcosm (Explanation below) of real society. They said “They just make colleagues to profit and get information from these people.” But through my proposed solution, it can be possible to make real friends. Also, it can be possible to share their real faith.

You seem to be really good at English, so I think even if I talk about complicated linguistics, you'll be able to understand me.

First: microcosm. I'm not exactly sure what your meaning is in this sentence.

Are you saying that people in college behave just like people in real society? Are you then saying that people in real society just try to make colleagues to profit and get information from these people? If you are, then say it like this:

.... because university is like a microcosm of real society, in which people "just make colleagues to profit and get information from these people."

If you are saying that university is different from real society, then use a different word. 

Second: "That" vs "Which"

Simply put, use "that" if you want to give information that will help the listener understand exactly which thing you're talking about. Use "which" if the listener already knows which thing you're talking about, and you just want to give more detail.

Examples:

I'm looking for books that can help me find a girlfriend.
 
In this case, I'm looking for books that contain information about how to get a girlfriend. If I just said I'm looking for books, the listener would not know what kind of books I wanted. Therefore, I have to add that can help me find a girlfriend so that the listener understands exactly which books I'm seeking.

I'm looking for books, which can help me find a girlfriend.

This sentence is a bit strange, but it can be correct depending on the context. The sentence has two possible meanings:

- I am looking for books, and this act will help me find a girlfriend.
- I am looking for books, and books inherently (원래) contain information that will help me find a girlfriend. 

I am not looking for a specific kind of book, so it is enough just to say I am looking for books. However, I also want to add more details either about books or my search for books, so I add a comma and then use the word "which."

More 예문:
I like looking at paintings that use lots of colors.

I really like looking at Rembrandt's Belshazzar's Feast, which uses lots of colors.

I'm looking for a rabbit that can jump really high. (I am implying that I want a rabbit that can jump higher than other rabbits.)

I'm looking for a rabbit, which is a furry animal that can jump really high. (I'm implying that the other person won't know what a rabbit is unless I describe it to them.)

If you don't wear warm clothes in the winter, you might catch a disease that will kill you.

If you don't wear warm clothes in the winter, you might catch pneumonia, which can kill you. 

NOTE:
In some older English texts, people use the word "which" in the way that people use "that" today. However, when "which" is being used like this, it's used without a comma, so you'll be able to distinguish it from the way "which" is used today.

Relationship Between Friends in University.

        Relationship between friends in university is too shallow, so it’s hard to make real friend. Our whole life is changing because of the difference between university and high-school student‘s lifestyle. University students are more free than before cause they are adult now. So all the things that we do and all the place that we go are totally changing. According to these huge alteration, our relationship between friends are changed too. Relationship in university is more light and superficial than before. It's because of these several reasons. First, in contrast to high school, students don‘t have any fixed timetable, so the lunch time and relaxing time is all different between them. Therefore, students don‘t eat and relax together. Second, students are usually doing a part-time job or tutoring, so they spend less time in university. Even after all classes, they don‘t have time to get along with each other.
        To solve this problem, joining particular club activity, which students are interested in could be great solution. Through club activity they can find real friend whose interest filed is same with them. (--------------------) Some will argue that it is impossible to make real friend in university because university is a microcosm of real society. They said “They just make colleague to get profit and information from their friend.” But through this solution it can be possible to make real friend. Also, it can be possible to share their real faith.