Replying to Trying New Tricks

Ok im just going to come out and say it. You may call me a poser or a wana be. The truth is im 14 years old and Ive never done a 360. I expect to see a whole bunch on negative comments but i dont care, ill pick out the good ones. what im asking for is how i can summon the balls to try a trick. Ive done a 180 but whenever im dropping in ready to try it i always puss. Anyone have any advice? Not on just 360's but new tricks in genreal.