do you believe some people are just not met to be in relationships? am I one of them?

I think that some people get cultured out of the "traditional relationship" framework. Just because your life has been very different from a hopeful romantic doesn't mean that you're not meant to be in a relationship. It could just mean that the kind of woman that would suit you is harder to find. That in itself makes it very difficult as some women usually have a shopping list of the requirements men need to even speak to them these days.
If I were to try and spin scenarios like this into something potentially positive, I'd say that maybe some of us need to learn a lot more lessons outside of relationships before we enter one. I'd like to think that it's like we're crafting a stronger personal foundation that can result in a stronger foundation for a relationship. In the same vein, it could be that we've got some sort of curse and any woman we have an interest in automatically relegates us to the friendzone.
Honestly, at the end of it all, my advice would be to follow your dreams where you can. Even if you find a wonderful woman, there's no guarantee she'll stick around for the long haul, there's no guarantee that she won't take half your crap when she's bored of you and there's no guarantee that you'll even have a healthy relationship. For me personally, I would have to find someone quite extraordinary for me to consider shooting a shot. The amount of times that shot has come back to wound me is enough to leave me with only my toe in the pool.
Despite my pessimistic rant, it is still possible and I'd encourage you to also keep an open, but simultaneously safe, heart. When you meet someone special, just try. It might work, it might not. Fundamentally though, if you've built yourself up and you're content with what you've built, at the end of the day, you'll have that even if you don't have her.