Ah don't worry. I think big nipples (big areloa's) are yucky actually. A lot of guys might agree with me; small nipples look better to me (turns me on!), and smaller breast size is fine also! Smaller breasts DEFINITELY have more benefits in the long run (they stay "perky" till a much older age; when those 36 DD girls have sagged below their waists!)!
I'm sure you're beautiful just the way you are, and if a guy could ruin that because your breasts aren't just the way he likes breasts in general, then fuck him!