I actually think I'm going to start busking soon. I did walk around for the first time yesterday, and everyone loved it. I'm 14, so this may be fun. No worries, I live in a community with about 20 thousand people, so I will know most who watch.
In all honesty, Maloney, you won't be taken seriously. I am 17, and I don't think anybody would take me seriously either. It's just the image of a kid as an entertainer that puts people off, and leads them to the "Aww, look at him try" sort of attitude. Part of the problem is that hecklers will not only heckle you about your act, but also about your age, and that won't get you anywhere. So unless you are very intimidating, or you have something that will subtly but legally keep hecklers from mouthing off, I would wait some years.
But if you really think you can and will do it, go right ahead. And do keep us updated as to your first performance when you complete it.