Lack of interest

Idk why but I can’t fully be interested in sex.. I’ll have sex be pleasured etc but it doesn’t last long. Guys get mad because I finish before they do. Then I think to myself that maybe it’s because the guys I deal with lack sexual acts & more in a rush to just fuck. Well I like to fuck too but I need to be fully satisfied with sexual acts.. in the middle of sex I’ll get uninterested & stop. Idk what’s wrong with me. When I’m highly interested in a guy I feel obligated to finish them off but when it’s sex with someone I’m not interested in that much but they turn me on it only lasts but so long in the middle of sex.. I guess I need to stop having sex with guys I’m not that interested in. Btw this may not make full sense but I’m going off of thoughts at the moment but these thoughts are very much true for me..