Hey mate! I think the wonderful thing about cocks is that they're all different shapes abd sizes on the same basic design - never ceases to amaze!
Yours looks pretty big and thick erect to be honest - certainly plenty big enough!!
Bit of friendly advice though: I wonder seeing your foreskin whether you can skin right back over the head? If not, you might want to get it checked out for phimosis as you could be missing out on sensation or finding sex painful.
Oh and BTW, I don't think you are supposed to show cock in your avatar pic (don't want you getting banned!)