Is it normal to always feel horny or aroused at the age of 18 ? if so , how can i stop feeling so horny without masturbation ? or drugs

Normal, shormal: What's so bad about masturbation? Which drugs do you mean? Libido loss is indeed a side effect of many drugs, but if you don't have the problem - you don't get the drug. Just try to use your brain, be careful to protect yourself from STDs, unplanned pregnancy and nasty people or dangerous situations. Once upon a time, people 'sublimated' sex drive and created art - perhaps that can help. Best!