I naturally suck @ martial arts--is there any hope for me?

[AlwaysOnTheRun]

So I've been doing martial arts on and off since late high school. I've trained in stuff from Kendo to Kung-Fu and Muay Thai, but the problem is is that I naturally suck at all of them. It takes me three times as long to learn something as it does everyone else. I instinctively do everything wrong, and I look clumsy and inept when starting out on anything. There used to be times when I would leave my lessons on the verge of tears because I felt so humiliated and stupid. No matter how hard I try I only look half as good as everyone else and I'm sick of it!
Is there any point to me doing it anymore? I wanna be good at it and learn all I can, but I feel like I was just born to suck...