Have you figured out exactly what you're scared of? Sometimes analyzing what's causing our fear can go a long way towards defusing it. Crashing is certainly an understandable thing to be afraid of, but you survived the first one and got it out of the way. There's no reason to assume that you'll ever have another crash again. And if you do, you already know that they're survivable, albeit painful.

The only way to gain skills and confidence is by riding. You've started out gently with rides around the neighborhood and that's smart. Can you extend those rides just a bit further each time until you get to a point where there's a hill? Then just do what you can. If you have to, get off and walk the bike, then try the hill again the next time.

And breathe. That's one of the most important things.