It looks like you have a very nice body from that pic. You have nothing to worry about at all. It's true that big boobs on your frame would be an added bonus. I mean if you were rocking Ds or DDs on your frame, every guy who saw you in that bikini would get an uncontrollable hard on! lol! But that's probably not what you're going for! :P
No not at all, I prefer smaller boobs to be honest... some girls look like they're smuggling balloons and on course for major back pain, even worse if they look completely disproportionate plus they tend to have larger nipples which is a pet peeve I have.
Actually I much enjoy, and even possibly prefer small breasts. They are easier for a girl also, especially ones who are athletic. Over all I'd say be happy you got what you do. I know a girl who just turned 15 and is already sporting humongous twins. I bet you she has some back pain.
They're not big, but since your skinny they look big on you. Honestly I think they look amazing, 10/10. The shape, placement, perfect :) You look like you have a great body! I'm pretty sure everyone on here wants to see them without the top lol!
Not a turn off, no. I'm not a boob guy, but all the girls I've been with in the past were about the same size or smaller. The most important thing is the shape, and how they sit on your chest. Yours are quite good from what I can actually see.