Moving fast and scared...

So I'm going to be 20 and just started dating someone for the first time. It's only been a few weeks and he's a lot more experienced than I am, so we're moving really fast for me, but also really slow for him. I know he wants more than what I'm giving him right now, but I get really scared and embarrassed. He had me attempt to give him a hand job about a week ago and I freaked out about it when I got home, but I'm warming to the idea a little bit. Any advice on A) how not to be so nervous about sex-related things, B) what do for a handjob (how to position myself to do it?) that isn't a blowjob (SO not there yet), and C) what an orgasm feels like, because everyone says I'll know when I have one, but I honestly don't know. I keep being told I'll feel a release of tension, but I've never felt that. Please just help my scared, virgin ass out here 😅