Is it normal that i think about sex all the time?

(21 f) Lately I've been horny all the time. Constantly thinking about sex at work or in school (also with a particular guy I've had 2 dates with but we haven't f*cked yet). Maybe it's because the last time I had sex was in Summer 15'. I only have sex about 2-3 times a year, since I'm single and it really sucks. IIN?