How Can I Achieve Really Strong Orgasms More Frequently?

Hi Betty,
Until about a year ago I was suffering from primary anorgasmia (which I have put down to the contraceptive pill). I am 24, started having sex at 17. My experiences with orgasms both solo and with a male partner are always clitoral and feel like a wonderful build but more like a ‘sigh’ of release. However, sometimes when I am on top I will have two of these ‘build and sigh’ orgasms and then I have this SUPER strong sexual arousal, the sensation that I’m about to pee and then more of a wave of release. I should note that with none of these do I feel ‘pelvic contractions’.