Coming out late (28) am I f****d?

So i've sort of just came out to close friends and my dad (not my mom as she's incredibly religious). I convinced myself I was straight beforehand, even had a 6 year relationship.I feel like I have to do a complete 180 on my life, and that i'm past my prime or whatever. I find myself mostly attracted to younger (18-25) nerdy shy guys (is that wrong? I have no idea). Every time I try and talk to them though it's obvious i'm inexperienced/nervous/insecure.My friends have been amazingly accepting of everything. But talking with a straight friend he was like "YOU HAVE TO GET OUT THERE AND HAVE SEX WITH A GUY NOW, YOU'RE ALREADY LATE AND YOU'LL REGRET IT FOREVER WHEN YOU'RE OLD". This scared the living shit out of me to be honest, I know he was trying to help, he's even going to a gay bar with me for the first time (which should be amusing).He was trying to be helpful but those words really stuck with me over the last few days and made me think of how my unwillingness to accept myself robbed me of all those cute university relationships I could have had. Something lost forever due to my own stupidity that i'll never get back. I wish I would have accepted myself earlier and kinda hate myself a little bit for that.Anyway this was more to vent, and I don't have any gay friends so any perspective on getting my shit together would be nice! Actually a lot of my friends have already started families and moved in with their wives/partners, and I just feel like some alien stuck at square one.