Bottom's penis is bigger than Top's. I'm [26M - Top] dating a guy [24M - Bottom] for 1 month. Ironic!?

I'm virgin, and I'm 90% sure he is too. I've always pictured me as a Top, and he seems to be a Bottom. We've been playing around, and we have already been laying naked. Is it common or ironic that his penis is bigger than mine? I have always knew that mine was not "big", but have always been ok. Is it true that it is actually a good thing not to be enormous, since it could hurt him more easily? Sorry for many doubts... Total newbie here!! Thanks in advance.