How to get myself in the “mood” again?

I feel so awkward writing this honestly. I’m 18, and my boyfriend is 22. We’ve been together almost a year and I love him so much but the last month or two i haven’t been in the mood to have sex. I feel like I’m too young and we haven’t been together long enough for me to be feeling this way.... I love my boyfriend so much. We live together and work together so we see eachother most of the time, besides when we work opposite shifts. I feel bad cause my man makes moves and tells me he wants me but I just can’t get myself into it. I think part of it is I just get really depressed sometimes, especially during the winter. I feel like nothing excites me anymore. Is there anyone else who’s gone thru this? I need some advice as to what to do about it 😫. We used to go at it like rabbits, like we couldnt keep our hands to ourselves. I just want to feel that way again ☹️