Do not overshadow your mind with negative thoughts, focus on the positive. Once you set your mind to make something happen, you'll definitely find a way to make it a reality. And if you don't, you'll end up procrastinating, coming up with excuses and blames as to why it won't work or hasn't worked out yet. Here's the thing, don't just believe in yourself, also believe that it'll work. You'll end up trying new things, and then you'll see the progress you've made. When you believe, you can perceive and that's the strongest push to keep you going.