Trying to orgasm but always end up disappointed

Each time I have sex I try so hard to have a orgasm even sometimes just to cum. Most of the time I do cum ( with the help of my own hands) however sometimes before I could reach my climax, my boyfriend cums before I can. It’s the most disappointing and frustrating feeling and I know most of u ladies can relate. 😭 I always want round 2 but we can’t do it without his dick getting soft midway. Anyways what can I do to enhance sex and finally get that orgasm I been wanting??