Dear, little, IF you through the masturbation based asked question in public forum all the time we explain that Masturbation doesn t harm your health and your penile shape and not even your sexual performance, it s natural and safest way to release sexual tension when partner is unavailable, penile shape varies from individual to individual as everybody s nose varies in shape and size . thin and broad at base is never an issue, and due excessive worry and tension you may be feeling poor erection. throw out all the rubbish that masturbation harms from your mind , concentrate on your studies first achieve your goal ,success brings happiness and happy people enjoy better sex than stressed one.