Its better if you wait. If you rush to have sex with unknown people, you may accidentally get STD, HIV or other diseases, which you totally DON'T want. You should wait till you find someone. Since you are 18, you are either in A-levels or probably first year in uni. Therefore, you should go and talk to someone, go to clubs, ask help from other peers and eventually you will make a girlfriend, which you can bang on day and night and safely if they don't have the viruses. Also use condoms and don't rush to get laid