So close.. yet so far

So when having sex I’m only able to get close to having an orgasm through clitoral stimulation, sometimes I squirt with penetration but it doesn’t feel like I’m quite “there” yet. When I’m on top that’s the closest I get to having an orgasm, I get there so quickly and it’s RIGHT there, and then disappears. What can I do to make sure I actually have an orgasm from being on top?

Sex is always amazing with my partner but it’s frustrating when I’m on the brink of orgasm and it just doesn’t happen! When I masturbate I’m usually able to make myself cum fairly easily, although I think my anti depressants might be part of the issue as to why I struggle sometimes.

Thanks in advance!