Group activities are alternatives. The important thing is to be among friends who will respect and support your decision to abstain from sex until you are married. There are two problems associated with substance abuse. Alcohol and drugs are dangerous because of the stupid things that happen while intoxicated. At least half of all spousal abuse is linked to alcohol abuse.
Self control is part of life, it's part of growing up.
Part of self-control includes avoiding things that can be additive. Promiscuous sex can be addictive. It can also be deadly. Sexual desires are even harder to control while intoxicated. It is also more dangerous because it risks the lives of unborn children.