I'm as straight as can be and I still think boobies is one of the most fun things to draw. Drawing something naked or near-naked doesn't say much about one's sexuality, so I wouldn't worry much about that. As for age, I've seen way worse stuff than some boobs drawn by people way younger than you, so I wouldn't worry about breaking some kind of record or something. Draw whatever you want, dear, age is just a number.
When I was 13 I drew mostly dragons, though... Youth of today
Thank-you and yea they sound like fun to draw so yeah I like horses and dragons too but I really like the idea and I know what you mean when I was 5 boys were drawing rude pics on school tables sometimes it is a bit far but you have made me know that boobs are not