Should I be concerned that I have no libido when im single?

Hi! 24 y/o female here. I am seeking some advice. I’ve been single for over 2 years now and i’ve noticed a particular pattern in my libido: it is completely non existent if I don’t have a partner. I don’t think about sex at all. When I have a partner my sex drive is extremely high but I can’t seem to be bothered when im alone. I just want to know if that’s abnormal? Shouldn’t I get “in the mood” from time to time? It isn’t about having an emotional connection with someone either, rather having a physical stimulus (an attractive man in my presence). When I kiss someone I think about it but besides that it’s pretty much in the back of my mind.