Whats wrong with me?

I feel sad a lot, insecure, and just bad about myself, I get in my feelings a lot and cry a lot, no one seems to notice when I’m sad, not even my fiancé. I feel so alone and when I talk I don’t think anyone’s really listening. Talking to my best friend is like talking to a robot, she doesn’t seem to show emotion when I talk to her about stuff. Sometimes I just want a hug from someone or reassurance but I don’t think anyone can give me that. I want to go to therapy to talk to someone but I’m embarrassed of what people will think, what my fiancé will think too. I guess I’m just lonely or sad, maybe over sensitive too.