I'm in my senior year of college, I've been with an ex since freshman year on and off. Throughout most of that time frame I didn't try to improve my appearance both physically and stylishly.

After the breakup I did what most others do and hit the gym HARD. With very good results.

Also developed a style that makes me feel confident and good looking.

Girls I considered never having a shot with ever in my life now approach me and start flirting with me.

Part of me still somehow psychologically activates my old mindset that I have no shot with these women even though they all hit on me and give clear indications that they are interested when I rewind my brain back. I tend to go lizard mode and my mind can't think of anything to say to flirt with them or even lesser thing like maintaining eye contact. I get dumbstruck failing to process why or how to react when a hot girl is talking to me. I can speak and flirt with less attractive women effectively but women I consider 8s to the occasional 10s override my brain.

Anybody been or is in a similar situation?

Tldr: I'm not used to hot women flirting or approaching me, gives me error code 404.