Low Sex Drive :( Someone Help!!

Just to start off I am very young (19 years old) and i’ve been with my boyfriend for over a year and a half and i love him to death and i’m very strongly attracted to him!! However, i can’t seem to ever be in the mood for intimacy. I don’t know what’s wrong with me or what to do about it.

We do begin with foreplay like just making out and rubbing up on each other but nothing seems to work for me :( And he is such an angel and doesn’t pester me about it or constantly bother me to have sex, he’s fine with it but i’m not! I just wish i had a sex drive and i don’t know how to boost it or what to do about it.