I(24M) feel like my girlfriend (21F) is settling for me. How to proceed ?

Hi help me get a perspective on this me and my girlfriend are together for the quite a while now, just another day she was telling me about the guys she dated or was talking/planing to hookup with.

Now most of the guys were just average but this one guy stood out he seemed like a tier above me like in looks department and boy it stung like nothing materialised between them, but he is handsome that got me thinking that this guy can take my girlfriend from me moment he wants it's just that he is not interested otherwise where do I even stand in front of him and I am kind of insecure since then.

I know my girlfriend has no fault in this and point is my girlfriend too is very beautiful so she is also a tier above me I don't know how to proceed with it and don't come at me with logic that she is with you because she chooses you and finds you attractive all I know all this what I am saying is i compensate for what I lack in looks department by providing safety so that is that so I get a feeling that she is compromising in the looks department just because I provide safety and in today's world men are not doing better, like if men start doing better I have no chance to be with a girl like her. So how do I proceed here. I don't want the resentment to build up I love her. Do I just accept that she is settling and if yes what makes the acceptance easier ?