Cuming w/o Porn?

This has recently distressed me a lot. When I masturbate alone ( only focusing on clit) I am able to cum while watching porn, not watching porn it takes longer or its close to impossible. I've been with my boyfriend for about a year and a half and I've only been able to come a hand full of times, it also takes way too long. I want to be able to cum more easily, not only for him because he is insecure about it (not that it really bothers me, the sex is still good) but for myself as well. I'm typically in the right headspace and I'm comfortable with him but I don't know how to get there. I'm worried it's the porn watching because that decreases the time significantly and I can cum a lot quick. Anyone with tips? Or have the same issues as myself? Thanks ladies 💕