Вместо I am very glad to your letter. лучше написать Thank you for your last letter.
I would like you to see.- I would like to see you.
How parents?-How are you and your parents?
Long ago I didn't see you. -I haven't seen you for so long.
So well that we still teenagers. -I'm so glad that we are still teenagers.
To be the teenager it cool!-It's cool to be a teenager.
At teenagers it is a lot of free time, they have no cares.-Teenagers have a lot of free time and they don't care about anything.
I got acquainted with the beautiful girl. It is similar to you. I want to marry it. -I've met a girl. She looks like you. We are going to marry.
Parents speak that early. It is necessary to wait a little.-Her and my parents think it's too early for us to marry, so we have to wait a little.
I would like to acquaint you with the bride. -I want to introduce her to you.