instead of writting formal english to your friends try writting slang.
Heres a little from New Zealand we use to text (mail) our friends.
How are you?- hw r yuu.? What are you doing tonight?- wot yur planz 4 2nyt.? Do you want to go to town and watch a movie or something?- wanna hit da twn nd watch a movie or sumfing.? How about i call you tonight?- iz it algud if i cal yuu 2nyt.? I dont feel so good.- ima nt feelin so gud. Im hungry- ima hungry I dont think you like me.- i dnt fink yuu lyk meh Thats my car.- datz ma car
Those are just how a lot of teenages(like myself) mail/text each other.