How do I move on?

I'm 24 and I have 3 children... All have the same dad. We was together nearly 9 years. He left me when I was 30 weeks pregnant and didn't really give an explanation as to why. But anyways he is messing with my head and the last week I've had enough I stopped talking to him. I've been really down since he left me and our children and had a lot of time to think on my own. One of the things is that I'm worried I won't find anyone who will be willing to accept me and my children. I know I have the rest of my life but I had my life set out when I was with my ex and now I'm in the dumps because I fear I'll be lonely forever. I haven't dated before.
How do I move on?
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