Needing Advice - Do not have much sexual urges - Wondering if normal

For a long time now I've been pretty nonsexual with my partner and with myself. I might have moment where I want to be sexual but that seems to happen once a month if that. I'm wondering if this is a thing among as I've read around the internet saying that it does happen to some men but I do not have any actual evidence from individuals proving this.I'm 20 now and started the whole sexual urges around 15/16. During the beginning masterbation was an everyday thing but after a while I got tired and sick of doing it so did not touch myself or look at porn for probably a year. Once I got some urges back around the age of 17/18 I noticed that it was greatly small urges that I would only get like a couple times a week and sometimes a couple times a month.I'm really looking for any advice that could help me as my partner is a very sexual person and he can't understand that I'm not even the slightest most times. More times than most I'm usually turning him down because I don't feel like doing anything and it's extremely hard to fake it cause he can tell and that just hurts him more emotionally.Anyways, any advice would be great and sorry for my weird paragraph typing, writing was never my strong suit during school.