Help: I Can Only Orgasm One Specific Way

So I’ve figured out that I absolutely love penetration, being eaten out, getting fingered, etc but it won’t make me cum. Pressure on my clit from another person, a shower head, or a vibrator doesn’t make me cum either. The only orgasm technique I’ve found is best used when I’m alone (I have to cross one leg over the other and gyrate). I know that this technique means I love clitoral stimulation but I don’t understand why other forms of clitoral stimulation don’t get me off. I love sex and I want to be able to cum in other ways with or without a partner. It’s sort of bumming me out. I recently tried masturbating my normal cross-legged way and then sticking my vibrator in me right before I came and it didn’t work. I felt this pool in my stomach like I’m going to cum but nothing actually happens.

If you have ANY tips, please help me. A girl is desperate.