Sex is not for me

So I’ve had two partners so far, still fairly new to this as well lost my virginity almost a year ago cheers to that....I’ve noticed towards the end of my relationship and with my new fwb, I’m not enjoying and haven’t enjoyed sex. I can’t finish. My minds so preoccupied. An I’m so focused on feeling what I used to feel that I don’t get that feeling if it makes sense. Any ladies had this issue ? Is so what helped you with this mile stone ? I want to enjoy the passion and chemistry of if but I don’t and it’s so much of a challenge to get me off now. It’s not that I don’t communicate cause I’m a talked an I tell him what feels great and what doesn’t.