Don't worry about your "negative" thoughts... They're par for the course in the jungles of time and space. Change them when you can, but when they overrun you, let them run. Because no matter how persistent they are, you can always spend just 5 minutes a day, in a quiet place, doing your best to imagine your dreams as if they've already come true; seeing yourself happy, laughing, smiling from ear to ear. This will be enough, it's always enough, even if while you're imagining, the negative thoughts creep in. After 5 minutes, leave it alone.
You're in time and space for one reason: to thrive. There's no 50/50 about it.
You are OF the Creator, BY the Creator, and now a Creator yourself, alive on a stage YOU designed for your own adventures. You were not an afterthought and you didn't design it to just eek by. All of the elements are beholden to you; you summoned them, you dreamed them into place, and now they conspire endlessly in your favor. "On a dime" your life can improve for the better with the slightest effort on your part, no matter how insurmountable the odds, nor how futile your thoughts and deeds may seem. You are "the prodigal child." In a heartbeat you're welcomed back into the fold. In an instant you can be carried along by life's current once you stop struggling against it.
And for all of these reasons, and more, it's therefore as if your positive thoughts are 10,000 times more powerful than your negative thoughts. 10,000 times more in alignment with the magnificent tidal wave of energy that you are. 10,000 times more likely to become the things you want than the things you don't want, when you know these truths and you act on them.