I don’t want to tell him I’ve been faking orgasms for years

It started when I was in my late teens and didn’t know what to do in bed. I have a steady boyfriend now but have yet to have an orgasm with him. It always seems easier to fake it and get on with things. I’m afraid if I tell him I’ve been lying he’ll drop me.
Worrying about achieving or not achieving an orgasm is a sure fire way to stop it from happening.