By game I mean, not just pick up women but how to built a magnetic personality to attract people?

About 5 months ago I made some drastic changes to my life. Started lifting and built an okay physique. Went to do improv which I always wanted to do. Started doing activities that scare me like meeting strangers that do similar interests through meet up groups. Started dressing better and grooming myself. I eventually found someone who is great.. but I still in self sabotage myself daily.

In many social situations I get in my own way. Even though I constantly try to remind myself I just want to have fun, the negative thought patterns get overwhelming.. "wow im a loser. I'm a nobody. These people dont care me. They see me as a loser."

Even with my girl i get this overwhelming feeling like I'll eventually lose her because she'll see me as a loser.

I dunno how to get over this. Im seeing a therapist for my social anxiety but I feel trapped in my own mind and I feel like even with this progress i'm still that same nobody