21 and no romantic experience. Feeling like a loser and left behind

I began to identify myself as gay a few months ago (see this post). When I talked with other gay friends after coming out I often found they had some experience of relationship (and sex) as early as in high school (14 or so).I think they are lucky to have realized their orientation at such a young age. My own experience, to be honest, is great and I feel proud about myself, on digging into myself and discovering and facing my identity, but I still feel I lost some good opportunities and blaming myself why I didn't reach that point sooner: if others can achieve that milestone earlier than me then I'm inferior than them and thus a loser.Teenage sex is always controversial, be it gay or straight. So it may not be right to feel jealous about others' having early sex. But romantic relationship: it is a "the more / the earlier, then the better" thing, isn't it? I'm worried I can't meet the right man, even when I'm already out. Am I setting too many requirements on my (potential) partner? Like similar education, similar political opinion and a top or versatile guy, of course?