I keep thinking about my future without my parents, help?

A lot of teens go through that phase of thinking a lot of depressing thoughts. It should pass so hopefully you can take some comfort in that. In the short term, you just need to keep your mind busy with friends or hobbies or anything so you aren't thinking of those things. In the long term, you should try and boost your independence and confidence that you will be able to manage on your own. You are vulnerable because you are young. If anything happened now you would need serious help in many areas of your life. But as time goes by it's a little less scary thought. You have plenty of time to learn to live on your own, believe me. I thought it seemed so soon and I would never be ready for it but now I'm 19 and I really feel almost there.