Don’t hate I just want advice

Okay so I’ve had sex with 12 people and have had sex from 5 minutes to 2.5 hours and it’s really good sometimes to where I’m shaking and screaming but I’ve never came or orgasmed and it really sucks because I really really wanna cum but I’ve never been able to and it is annoying when I’m focusing on the guy cumming because I already know I’m not gonna be able to. I was able to cum once with a viborator on my clit for like 30 minutes and I came three times back to back because I kept it on there after cumming each time but I couldn’t even keep my legs open and I’ve never came since even though the sex is very good but I didn’t orgasm even then. So idk what to do to help if. Even if I use a dildo while using a viborator I can’t orgasm and I really want to experience it.