I Am Emotional

I tend to easily become emotional because I feel alone. If I had someone with me I know I wouldn't feel so, but I keep feeling unwanted by girls. I have no issues finding guy friends and such but I can talk to like 20 girls online and only one would show a slight interest in me.
What bothers is me is that I don't know why they don't show interest in me. If I don't know it, I can't freaking fix it!

I'm intelligent, I study a masters program which is not very common in my country so I'm considered highly educated. I am talkative when we're talking/chatting

So I'm wondering, am I boring? Or is it my looks? Or what else could it be?

Most of the times I don't even get any reply at all. Which leaves me wondering, are all those girls just douchebags who doesn't even have the tiny little respect to let me know they're not interested?
It's simple, just tell me you're not interested and I get it, I'm not retarded.