Just remember this
There will always be someone with a better body, and more attractive than you.
So get comfortable with yourself and there will be no need to feel the urge to "fit in" here.
I'm no where near as big as half the guys on this forum.
I also have a small frame; can put my fingers around my wrist really good test for that.
So I know I will never be as big without possibly juicing or working my ass off beyond belief.
So ya, athleticism isn't just about being big.
I have so much energy and can play tennis, soccer, or hockey for hours without getting tired, I just can't lift as large of weights and get as big as other guys.
Doesn't mean like I said I'm not athletic.
What I'm getting at is learn to accept there are different body types and different preferences for them as well. I personally dont like huge bulging muscles, they just remind me of blood flow and bodily functions...etc, so they're almost a turn off. I like muscular , but lean bodies.