How old are you?
While all of this is very individual of course, there's definitely a pure age/ sexual maturity component as well as an experience/ technique component.
As in, what doesn't work for you at age 17 may work great for you at age 19.
Also, why are you having sex? Like, are you attracted to this guy? Do you want to kiss him and be physically close, or are you just doing it because it's the thing to do?