Do I have a small bra size?

ok I know I do have a very small bra size, but I don't know, maybe it suits my body? sometimes it makes me feel really insecure. I'm 16 and only a 34a. but I am really skinny (my friends joke about it), I'm 5'4" and weigh 102 pounds. I think all the girls in my class have a bigger size than me. but there is a few guys I know who have liked me and one of them even called me hot lol.. even though I don't always think so. I'm mostly (pretty much) satisfied with the rest of my looks and people tell me I have a pretty face. I have had a boyfriend before. so tell me, do you think this size suits me? I'd like to get a bigger size soon, but how?? (please, no rude comments or I will report you)