Worried a little!!!!

So my bf and I have been together since June but he never exactly asked me out. We have been having sex since August. He treats me like a girlfriend. We go out and hange coffee, got to movies, go get food. I have met his dad, mom, sister, brother in law, youngest sister, his friend and friends fiancé. My friend is pissing me off by her comments on that is only FWB and that he is using me. He knows how I feel about him, and I know he wouldn't still if he was bad he knew because he knows how bad I have been hurt in the par and he has been hurt in the past as well. Also he's 24 and im 18. Any advice or opinions to calm my nerves please