>I would have killed to know that that wasn't the case.

Same. It's actually pretty important information to know at that age, as it'll help prevent you from settling into a LTR with someone that you're not compatible with, because "I'll never do any better."

I was most recently single at 43, and my dating prospects were pretty great compared to what I experienced at 22. If 22 year old had been able to foresee that, I would've saved myself quite a bit of grief.