Anyone here have experience with group sex?

Asking cause I'm new to trying gay stuff, and right now it looks like my best bet for trying it is this married gay couple I'm friends with. They've both been flirting with me for a while and I'm def interested... but every time we start getting frisky, I get intimidated at having both of them focused on me, and end up chickening out.

I trust them both enough that I'm not worried they're gonna hurt me or anything, it's just... idk, they're a couple and they're both older and bigger than me, sp I can't help but feel like I'm jumping in the deep end here.