The trick that we somehow fall into is in believing that we have to accept the state that our minds are in. This is not true. We have the power to change our way of thinking. It takes practice, prayer, and obedience to God's word.
Everyone struggles with doubting thoughts in their minds in some way or another. Recognize what those are, and for each of those thoughts, write out and memorize thoughts opposite of those and rehearse them every day - sometimes more than that. As those old ways of thinking arrive in your mind, immediately renounce them and replace them with your new and positive thinking. Instead of thinking about what you are not, think of what you are and what you shall be. Instead of thinking of what you have failed at, think of what you want to and will accomplish in the future. Instead of thinking of what the enemy tells you, think on what God says in His word.
Every negative thought and habit needs to be replaced with something positive. Be proactive in making you a better person and don't expect God to do all the work for you. Don't go another day letting your mind toss and waver you. Tighten up those thoughts and see yourself already where you need to be.
Someone told me something powerful that I never forgot, and this person didn't even have God in their life. He said...
"If you want a better life, then live as it that life already exists. Replace the 'I wants' with 'I am' and watch how that life unfolds as such."
Try these scriptures:
Try these aspirations:
I am happy.
I am healthy.
I am successful.
I am saved.