[orgasm troubles] 20F trying to achieve my first orgasm

I'm young so of course, I still have a lot to experience, but I feel like I've had enough sexual encounters (4 male and 1 female) that I should know my body well enough to orgasm. Masturbation does absolutely nothing for me, it's boring (note: I've never tried using toys, just my fingers); and oral sex does near to nothing. I could live without either. What I've found feels best for me is PIV sometimes combined with clitoral stimulation. Last night, my boyfriend was on top of me with my legs on his shoulders, and he was rubbing my clit; I think I felt right on the edge of an orgasm (although I could be giving myself false hope), it started feeling extra amazing and my body was beginning to tense so much that for moments at a time that I was so tense I was holding my breath. Not sure if that makes sense, but it felt incredible. But orgasm never came. My questions are: 1.) What does it feel like right before orgasm, and does it sound like I was close? 2.) What should I do to achieve my first orgasm? 3.) I've heard from a lot of women that vibrators are key to your first orgasm; what vibrators to you recommend, what should I expect, and how exactly should I use it?