Could you correct my English?

I am studying TOEFL ibt. I'll be happy if you correct my English.

It is more important to keep your old friends than to make new friends.

I think it is more important to make new friends.

First, it gives us good mental affection. Some people don't like to make friends because they are too shy or nervous when they meet strange people. It is a natural thing and I also feel like that at first, but one day I realized that making new friends may have some positive aspects so I shouldn't avoid opportunities to meet new people. I made a new friend who likes to action upon her interests as soon as possible. I envy her because I tend to worry about many things when I start something new; however, her action makes me more active. I became a more positive person. Her passion changed my mind for the better. I appreciate the day when we became friends.

Second, it may lead to an increase in salary in the future. For example, when you move to or join a new company, you have to introduce yourself in front of everyone you don't know. At lunchtime, you won't be able to eat with anyone since you have no friends. If you try to make new friends and create good relationships, make an opportunity to talk to the senior guys. They have ideas to judge your performance and to make decisions about your money. Because you and your boss are good friends, you may get more money. That is why it is important to make new friends.