We often manifest things we don't want because of deep-seated beliefs in our subconscious mind. These beliefs may include the idea that negative things are supposed to happen or that we don't deserve what we desire. Our current reality is a reflection of our past beliefs, so to manifest better things in the future, we need to change our present beliefs. Additionally, giving away our power, lacking clarity and a clear vision, and holding onto a negative mindset can all contribute to manifesting negative things. To overcome this, it is important to become aware of our beliefs and take action to heal and change them.