The thing is: Do not freak yourself about things that are not even remotely real yet. It doesn't worth it. You get crazy imagining scenarios and problems that are unrealistic and nonexistent. You get anxious over nothing, and feel like shit because your brain is being an evil asshole inducing you to give up trying. My tip is simple: take a deep breath and realize you are here NOW. Work with what you have, you can look into the future sometimes but don't try to guess stuff. If you pay attention to the RIGHT NOW of things I assure you that you'll live a much healthier life.