Deadbeat father, help?

So my son is almost 2, we live in California. the dad left me when I told him I was pregnant, in nov. 05. We were in a relationship. hes the only one I was with, I was 18 he was 16. I'm 20 now he's 18, we haven't spoke at all, he changed his cell phone number. I have hid address and home number, I just wanted to be a good mother, which I am, and thinking of him just made me weak, and here I am just wanting for my son to know him, he's lied about me so much, and after all this time he probably thinks my son isn't his, i'm scared to go to the courts he can alwas lie,I don't want him to hae rights of my son. And, I don't know what else to do? And how to go about it? What would you do? I feel like he's getting away with this while i'm stuck. And my son means EVERYTHING to me! I just want the dad to grow up sep up and be a dad, do you thnk he could still love him after all this time?