Why are people desperate to leave me?

I believe that the title pretty much sums up my question; however, to answer your questions of why I am asking this I will provide you with a little of my past.

Throughout my childhood I had a few friends but all of them left a couple years after having met any given one. Since I was a little kid I had no trouble making friends but it seems that it was and still is to this day, impossible for me to keep friends. They come into my life for a while and they all get bored and leave. Am I a boring person? Am I the kind of person that people don't want to hang around? I just don't understand why no one will stay in my life.

Especially when it comes to romantic interests.. Every single person I have ever become romantically involved with has left for me for someone else. Is that just extremely common or am I just someone who no one wants to be around?

I'm starting to give up hope with friends. I feel as though I can't make lasting friendships and the only ones that I can make, the short ones, are too painful to endure.

TL,DR (Too Long, Didn't Read) what I am asking is this all coincidental or am I really the kind of person that no one wants in their life?.. And should I just give up on friendships?

It's all about looking at fundamentals of friendships - have fun, encourage and support.
Ask yourself - "what do I love to do?"
Then you can ask yourself "what do I love that someone else out there probably does, too?"
As for encouragement and support, how are you as a listener to issues, how are you as a supporter or motivator?

Also, the living style of your place (urban, solitary, rural, etc) is one of many factors through which we can understand your situation.

Don't give up hope. If you're making friends, perhaps you need to think of ways of having longer meaningful relationships. Perhaps finding things in common might help. Or inviting them out for activities - movies, coffee, walk etc. to keep the interest going.

Friendship is limitless communication. -- Irwin Shaw (a great writer)

To me, there are levels of friendship. Acquaintance first. Light conversation. Humor. Sharing of ideas. Then a slow walk to real friendship where you talk at gut level. You can (almost) say anything to your friend and it's OK.

Both stages are critical to keeping good friends. But also, it takes understanding when they move away, or find some other interest. It is not you. It's them. And there is no fault here. No blame. Life is one imperfect activity after another. And friendship is not perfect. People are not perfect.

Just be YOU. People will gather around someone who is comfortable with his Self.