How can I be more selfish during sex?

Hi, I'm (26M, straight) having trouble with being too much of a "giver" during sex.

What I mean by this is that, during sex, I'm always thinking about the other person feeling pleasure. Every thrust is more about responding to my girl's moans than about my own enjoyment. Only once I realize she's had enough (either because she comes or because she gets tired), I focus on my own pleasure and cum a few minutes afterwards.

I get that this isn't a bad thing per se, but it gets in the way. It makes sex feel tiresome, as it feels more like tending to someone else rather than a 50/50 experience. I know there's a time to be a giver when I'm down there eating her out, but my mind makes the whole experience more about her than me. Even when she's blowing me I'm thinking "oh I'm taking too long," "she's getting tired," that sort of thing.

Again, I don't think this is a negative part of me. Yet it takes away from that whole raw experience of just grabbing her body and fucking it to my own desire - which is arguably way more sexy.

In other words, I'm having trouble reaching that moment where I can say "ok, it's my turn now." Any tips?

I'm guessing a lot of you will tell me to make her cum before PIV, but that's not always possible, and not all girls like to keep going after orgasm. My ex, for example, could only come once and then she'd lose her libido. The girl I'm currently seeing doesn't like long oral and fingering sessions, so she often cums after PIV...