Feel like something is missing

For most of my adult life, I haven’t felt happy and I have had GAD for at least 10 years, maybe more like 18 years when I think about it. I also have this strange feeling like something is missing in my life. I have always been attracted to women and anything sapphic in nature, but I have always pushed the thoughts away and assumed I couldn’t be a lesbian because I liked men so much.

What I guess I'm asking is do you think this feeling that something in my life is missing could it be because I have been denying myself the reality that I'm bi? Could it be because my body wants to be with a woman in every possible way? Sometimes it is all I can think about even though I'm in a monogamous heterosexual relationship and I have never been with a woman before. There isn't a specific woman I want to sleep with but just the idea of being with one is a desire I wake up with nearly every morning.

Has anyone else felt this way before they realised they were bi?

I fear that the only way this desire is going to disappear is if finally give in to it.