(It’s weird to call it “falling in love”, because it’s more like a childish and annoying infatuation, but anyway…)
I’m already terrible at socializing, but it’s especially difficult for me to create genuine friendships with women because I can’t help thinking of them as “possible future partners” (or some bullshit like that) and feel “jealous” when I see them talking to other men. It’s stupid, a really stupid and annoying felling.
I know there is something in me that I need to change, but I don’t know what, and I need some assistance.
I would like to feel more comfortable with my singleness and reserve my feelings for someone who can really reciprocate, while forging more non-romantic relationships with other people.
This makes sense, but I don’t think you need to change your feelings. Your actions are what affect the people outside of you, they don’t know what you are thinking, and you already recognize it’s not reasonable.
I remember when I went back to work after a few years raising my kids. It was odd to work with men, after only being close with the one man. But over time, it got normal and I am friends with some of them still, platonic friends. So some of it is literally just practice. Keep practicing. You sound pretty self aware, I think you will be ok.