I do think that feeling is normal. I've had that feeling. I'm not saying anyone needs to go out tonight and find their one true love - stuff like that needs time. My comments were aimed more at those who never/rarely actually try/have given up. As sappy as it sounds, I just honestly believe there are multiple possible someone's out there for everyone. It's not like women are a different species, they're only human and come in just as many different personalities as us. Finding the right one can take time, sure, but I hope you won't give up forever just because you've been turned down. It hurts, but it happens to everyone.
Also, nothing wrong with devoting more time to yourself with work/studies right now. Just as important.
I don't believe anybody is 'not cut out for it'. I felt like that, and I'm really not some sort of modern casanova or anything. I'm a skinny white guy who likes reading and nerdy, boozy conversations about nothing with friends. I'm not trying to paint myself as some beach hunk with great abs or anything. And, as soon as I realized that I was done being by myself and put some effort in putting myself out there, I realized that there were plenty of girls willing to hang out, have a great time, and in some cases develop something (although I'm out of the dating game now, living together with my almost 3-year girlfriend now).
I know it's hard to take those first steps, but don't think of it as 'fighting' or 'wasting time'. Don't see a date as a possible first step to sex/a wedding. Just think of it as getting to know someone and having some fun conversations, and just see what happens after that. I know rejection can hurt, badly, but if you're going to ignore that completely and focus entirely on video games/tv shows/whatever - that kind of happiness just doesn't last.
Again, some people are apparently happier alone. That's totally fine. Nobody needs a girlfriend, but I do think that anybody can have a girlfriend. No matter how undateable they might think they are (and I used to be extremely undateable).
Even if it means you need to work on yourself a little bit (not change who you are, just making yourself slightly more presentable/comfortable/happy with yourself), I'd say it's worth it.