Yes I did.
I regret not taking more opportunities.
Thanks to a comment, I'm going to elaborate.
What did I do? I sucked dick in a bathroom after school when I was a senior in high school
I was probably 15 when I discovered I liked men. And 16 when I came out. (Bad time for me, having a hard time at school, not because of my sexuality but other reasons) Mom accepted it, thought it was a phase (she gave that up last year) and fully supports me. Never had any issues regarding my sexuality. (very spiritual mom, never believed the church teachings). I'm incredibly lucky.
But anyway I'm way too shy do anything but senior year, an opportunity came out the sky and walked towards me. We talked, found we liked men (he was very flirty and I was honest when he asked me if I was gay)
We arranged to meet up after school (he had to work). Went to a bathroom stated feeling each other up till eventually we took turns blowing each other. I liked it...alot.
But I was no good at sucking
Well the school year went by and we met up 2 more times (both in the bathroom after school). I was way to shy to take the initiative and ask him and waited. Wasted 4-5 months in the process.
My blowjob skills got better.
School ended and we agreed to meet up at least once during the summer. I know improved my technique. I blew him and he shot his load in 3-5 minutes

I tried topping but was too nervous. I tried bottoming but was too nervous. (I'm very shy about weight) So I just played with his dick alternating between blowing him and jerking him. He came again and I got nothing

What little penetration I experienced, I liked it. Loved having a dick in my mouth. Would love to do it again.
And that's how I knew I'm not straight!