My sex drive is much lower than it used to be (seeing doctors to try to find out why), but I still think of sex a lot. I had a very strong sex drive when I was younger, but I wasn't very sexually active. If it's not causing you problems in your daily life, I don't think you should worry about thinking about sex most of the time. Just enjoy it. As long as it doesn't interfere with your life and relationships, it shouldn't be a problem.