Is it normal that i'm so sensitive?

I am a 21 year old female and I had only two "real" girl friends up until recently. Both of these people I have known since I was about 8 years old.

Over the years, especially the high school ones, we lost touch a bit and went our separate ways. Though they always found new people to hang out with, I had trouble keeping the new female friends that I made and usually ended up getting along better with my boyfriend's friends (males). The few times I made girl friends, they usually got mad at me over something that didn't happen and used it as an excuse to talk about me and spread mean rumors. I guess that sort of scared me away for trying to have a relationship with any girl ever again, always being wary of what they really thought of me or what their true intentions were.

I came to be happy with having just my two close girlfriends until recently one of them called me a "liar" stating that I lie about everything, and when I reacted by being hurt and confused...and angry, she said she was just joking. I get told that I am too sensitive or take things too personally but to me calling someone a liar is not a funny joke! Needless to say we fought and she basically just text me non-stop about how my whole life I act like this and that and I'm so this and that.... I told her to come say it to my face, my usual defense being act like a tough guy when being attacked... Anyway, I don't think we'll talk again now and so that leaves me with one friend.

I like being sensitive, I don't want to change who I am just so I can make nice with more people. It makes me more in tune with others feelings, it makes me less likely to hurt someone else! So why is it so hard to make friends! Is it normal that I only have one friend? Is the common denominator here me? Am I the problem? I have no idea, a part of me says maybe though I can act tough, I don't have thick enough skin for society. But the other part of me says so what, I don't want to be that way anyway.