Nervous to try

So I have sucked one cock in my life, 16 years ago, when I was 16. (he was 15 at the time)

I didn't love the experience, like a good boy, I swallowed, but it didn't move me in any way.

The urge always stayed with me, the idea and thought of sucking cock makes me ROCK hard.

Deep down, I want to do it again.

A couple of years ago, I tried meeting up with someone I knew who was gay. He found out through a drunken conversation that I had once experimented with a guy in high school, and this got him keen on my mouth.

We met up but when I walked into his house, I had a damn near panic attack! I couldnt do it. He was great and let me go, but said if I ever want to try again, to hit him up.

I want to, but I'm nervous. I also feel bad for this friend of mine as I gave him blue balls. A part of me (on top of wanting to try it) feels I owe him on some level also. To my knowledge, as well, he has kept my secret, which I greatly appreciate.

Here is kinda what I want from this: can someone here either pump me up into doing it or talk me down to earth?