masturbation will never cause these problems as you are having. semen is produced daily. so even if you do daily there is no harm. but too much of anything is bad as you can utilize your time for something useful to you. you have not mentioned your age. i suggest you to do masturbation on alternate days. do not stop doing it which will help you realize that it is not harming you. secondly negative thinking has nothing to do with masturbation. you should start doing some exercise daily. spend some time in meditation and prayer. learning yoga and meditation will help you a lot. for your depression i suggest you to consult a psychiatrist who will help you to boost your confidence with few medicines for a short time. be happy and find different ways to be happy. remove the fear of masturbation. for further information consult a sexologist online --> <link>
can masturbation cause negative thoughts?