When I was 18, I wasn't really interested in sex. At the time I was straight. I then turned 19 and started having a few sexual encounters - I was much more sexually active after a good few drinks, and would hardly be aroused at any other time. I then met my boyfriend and settled into the swing of a relationship. When I was 23, I met a woman I fell in love with, and our sex-drive went through the roof. But there was a great chemistry. The relationship ended, and I am back with my original boyfriend. I don't have a particularly high sex-drive, but it's there.

Give yourself time - some people do mature at different speeds.
You also have probably not met the ONE - you will know all about the chemistry when you meet the right person for you. You say you enjoy orgasms and masturbation, and you will enjoy sharing this with someone else. When the right chemistry is there, you won't be able to keep your hands off your partner