Welcome to HCM.
First of all you have to get rid of your guilty feeling of doing Masturbation
. That is quite normal. Sexual feeling is innate instinct for every one. When your marriage is getting delayed nowadays and if sex is forbidden in your society then hand sex is the only safest answer. If an individual starts sex life early in his teens are not having any sexual problems then Masturbation also is safe. It will not affect your health and future sex life. If you really want to get rid of this habit get married soon and have your marital relationship. Drugs are not necessary.
Try to reduce the frequency.
Regarding your tremor
hands, it may be due to your anxiety
and other causes. Get it cleared from your Physician.
Once again there is nothing to worry.