I can't orgasm

Imani • I was cute until I started speaking my mind.

It's so weird but I've been sexually active for about 2 years now but I've never climaxed. Don't get me wrong I'll enjoy the sex but I won't orgasm I only do when I'm stimulating myself. Is that something I should be worried about??? I don't want my s/o thinking he's not doing enough but I can never seem to cum. Help me.