I'm scared I'm about to get caught by the police
Why are the police coming after you?
I did something illegal.
It's not smart to do things that are illegal because the police will come after you and you could be put into jail. In the future you should always abide by the law so you don't have to worry about the police arresting you.
Nah, I'm going to run away.
I think it's would be more wise and would help your case if you complied with the police. The more you resist and struggle, the bigger your sentence will be. So how about just turning yourself in, so you will get off easier?