This is my introduction ('introduction' is name, 'introduce' is verb)

Please correct these sentences ('this' is used for singular nouns, 'these' is plural version)

I'm glad to see you! (Alternatively you can say "Nice to meet you")

My major is international communication and I want to improve my English and learn new languages (I'm about to learn Russian or German...and more )
I love to discovering cultural differences between Japan and others
My hobby is to drawing a pictures and to reading MANGAs　(for example, HETARIA)

When we talk about hobbies, we use gerund, -ing.

If you want, we can be friends. I am looking for Japanese friends. I want to learn some simple phrases plus I need to plan my trip to Japan.

It is my introduce. Please correct these sentences.

Hi! This is Ina.
I'm glad to see you! Let's help each other!
I am a Sophomore, 19 years old. My major is International communication and I want to improve my English and learn new languages (I'm about to learn Russian or German...and more )
I love to see the cultural differences between Japan and others. 
My English is not sufficient. But I'll do my best.
My hobbies are drawinh pictures and reading MANGA　(for example, HETARIA)

I'll help your Japanese if you want.
Please contact me! Thank you!

This is my introduction. Please correct these sentences.

Hi! This is Ina.
I'm glad to meet you! Let's help each other!
I am a Sophomore in college and 19 years old. I am majoring in International communication and I want improve my English and learn new languages (I'm about to learn Russian or German...and more )
I love to feel the cultural gap between Japan and other countries.
My English is not sufficient, but I'll do my best.
My hobbies are to drawing a pictures and to reading MANGA manga (does not need to be all in caps)　(for example, HETARIA). 

I'll help your  with your Japanese if you want.
Please contact me! Thank you!

I hope this helps!

This is my introduction. Please correct these sentences

Hi! This is Ina.
I'm glad to see you! Let's help each other!
I am a Sophomore. I am 19 years old. I major in International communication and I want to improve my English and learn new languages(I'm about to learn Russian or German...and more )
I would love to experience the cultural differences between Japan and other countries.
My English is not sufficient. But I'll do my best.
My hobby is to drawing pictures and to reading MANGA　(for example, HETARIA)

I'll help your Japanese if you want.
Please contact me! Thank you!

This is my introduction. Please correct these sentences

Hi! This is Ina.
I'm glad to see you! Let's help each other!
I am a Sophomore. 19 years old. I major in International communication and I want improve my English and learn new languages (I'm about to learn Russian or German...and more )
I love to feel the cultural gap between Japan and other cultures. 
My English is not sufficient, but I'll do my best.
My hobby is to draw pictures and to read MANGA　(for example, HETARIA)

I'll help your Japanese if you want.
Please contact me! Thank you!