Need Some Help

I'm 17 and I don't masturbate. At all. I've tried and it just makes me uncomfortable... I have tried recently because im trying to love myself and my body. But I would like to know if anyone has any tips on how to relax and really get into it. Or any tips in general.

Also, any time I get sexual with the partner i happen to be with, I never orgasm. And I've had many sexual experiences but I simply can't. I enjoy how everything feels but I haven't had that 'moment' and it makes me feel like a let down and that somethings wrong with me. Is there anything that I could do to try and fix this?

Thank you.