Hello Blue Sky! ^^ Thank you for submitting your homework today. Kindly take note of the corrections that I made. Thank you! ^^

Blue Sky:I have used a computer for 15 years old
Correct: I started using a computer since I was 15.

Blue Sky:so I like to use a computer .
Correct: That is the reason why I like computers.

Blue Sky:and I like to read computer's kind of books.
Correct: I am also interested in reading computer books.

Blue Sky:I like painting and I am learning painting the rest of the time .  -Correct

Blue Sky:and I like to go to billiards room .But I don't like smoking . The billiards room is full of cigarette smoke .
so I am debating in my mind whether to go or not .

Correct: I like to play billiards but there are a lot of people who are smoking cigarettes in the playing room. I am now thinking whether to go there or not.

Blue Sky:I like to take pictures. -Correct

Blue Sky: I have two SONY cameras .
Correct: I actually have two Sony cameras. 

BlueSky: I'll take pictures go to the Boracay again,if I have enough time .
Correct:I'll take more pictures when I go back to Boracay.

General Comment: Choose the better words for your sentences so that you will be well-understood.