I've lived most of my life afraid of trying new stuff, because of fear of ridicule, of failure, of not being good enough. Now I see that living like that was a big mistake, I've started doing new stuff and I really sucked at it, but there isn't a feeling in life more rewarding than making progress, looking back at your initial failures and realizing how far you've come from there.
If you're considering starting something, just do it. Please, you can thank me later. :)