What to do if i am 18 and a 34aa, will my boobs grow?

Little growth likely: If you put on weight in general, there will be some growth. Also, during pregnancy your breasts will enlarge and some of that will stay with you. I asked some young adult men out of curiosity to your question, and to my surprise many of them said they preferred smaller chested women - they said they felt overwhelmed by large chests. You will most certainly find a man who likes them just that way!