Take care. I figure most people hear all phrases and empty words in situations like that. There might be something true in those phrases but I'm pretty sure they don't light anyone's mood. I think it's completely valid to be picky with dates. I did the same. Also meant I was older than lots of my friends when I found a first partner. Like way older. But these go along. You can't have it both ways.
And reading through the other comments here, it seems you're struggling with your own identity. Who you are, who you want to be and what makes you you... I can only say having had sex is not a big part of what defines someone. It's mainly other things. And btw, if you hook up with someone and their main concern is whether you're virgin or if your body-count is exactly right... They're not paying attention to who you really are. They should like you because you're interesting, or funny, have similar goals in life, or you're a nice person, maybe someone to trust. Those are the important things about people. Focusing just on sex is for people who are mostly concerned with that. I'd say valid if you're looking for someone for a one-night-stand, but next to unimportant to long term relationships.
And with the other milestones in life... I think I already gave my perspective. All the find a girl, build a house, settle down and the proper ages for that originate from other people. You can choose to take it and run with that. Or these aren't meant for you. Sometimes circumstances don't allow for it, sometimes it turns out it's not what makes you happy. And seems you're not in a particularly bad place. You're relatively young, you took care of your education and are about to graduate. You did a good job with that. I agree it'll become harder to meet new people once you start an internship and then start working. And you're at the correct age to re-evaluate your goals and what you achieved. We do that at certain times in our lives. Finding one's identity is hard and a struggle. I don't know your whole story. I mean if you're otherwise well, feel free to explore and/or be who you are. Or change your mind about things. Just try to find your own interests and passions. And take your time with that. If it feels hard to do it, that's because it is. (Disclaimer: All of that is just my perspective on life. Not necessarily true.)