you have a beautiful mind. your experiences, believes, thinking and perception makes you, and you as a whole, physically as a body and your mind as its own entity. this matter that resides in your head, they would disappear in this world in time to come but everlasting in another... to infinity.
do not despair or feel unworthy, because it is only temporary as change is constant. there would never be the same moment ever again. keep up, you are doing well.