Relationship/sex advice

I’m a lesbian and me and my girlfriend have been together for a little over 3 years and we’ve lived together. Since towards the end of last year our sex life has changed/declined drastically, or to me it has anyways. We used to mess around a lot more and have really intense & wild sex. I don’t know what happened really for it to change though. She works a lot during the day. My sex drive is crazy high most of the time but it makes me feel bad if she’s worked all day and when she gets home and I can tell she’s tired I don’t really wanna ask for it. At the same time I don’t like the thought of planned sex, I like when it’s out of no where and I’ve mentioned it a time or two. I don’t like to be the one to indicate it either (I know that’s kinda of a bad thing), I want her to just grab me and rip my clothes off. This month we’ve only done it once and last month only 3 times :( it’s starting to make me feel bad and be grouchy towards almost everyone around me. I’m a sexual being and I need it; I don’t get the attention I need from doing it myself & I want her. I just wish she wanted me as badly as I wanted her. I’m somewhat Submissive in most ways so im having a little trouble.