21 and never masterbated

Hi, i'm a 21 year old male. I have never masterbated but i have pretty regular sex (maybe once a month roughly, usually one-night stands). Living with the guys i live with in college and hearing how much they masterbate really shocked me and made me feel weird for never doing it. I do watch porn sometimes and just get a boner and nothing more. Anytime I try to "jerk off" i just dont like the feeling of doing it, the skin on my penis is pretty tight and there is little up and down motion when I try it do it, maybe because i'm circumcised? I once tried lotion but my mind just wonders watching porn and I go soft.

Anyway most searches on the internet have pointed to a low sex drive or asexuality but i really don't buy that as I really do enjoy seeking sexual partners and spend alot of time thinking abouts girls ( sexually, trying best not to sound like a perv, just trying to get point across that I am a red-blooded male!).

What does anyone think? Anyone feel the same?