I've been let down by people before...when that happens, I just spend more time with my plushies, die cast Cars, and other imaginary friends...they've never let me down, and they never will.
It's gotten to where I actually enjoy being left totally to my own devices and enjoy solitude.
...but that probably isn't helpful, so my question is: do you know anyone who shares the same interests as you? Usually when I make friends with somebody, it's usually over intense shared interests, like animation and stuff.
Having a friendship forged over shared interests is sometimes easier than a friendship that involves going out and doing things...does that make sense? A lot of my friendships are like that - they arise from shared interests.
Hope I helped! 
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I wish Sterling Holloway narrated my life.
"IT'S NOT FAIR!" "Life isn't fair, Calvin." "I know, but why isn't it ever unfair in MY favor?" ~ from Calvin and Hobbes