Going out with my friends last night I noticed I have a serious problem: I am seriously rigid and uptight and have an inability to have fun at clubs/bars

I am well enough talking with people during the day and normal settings but just loosening up and having fun at nightlife venues I just hit a mental block like I have no idea what to do.

Friend and I entered the bar to pick up a friend who worked there to go out and we stayed shortly to talk. I was intimidated by the place and wanted to gtfo asap. I can approach people in daytime and chat well enough but my frame was just shattered in this venue. Everyone was taller than me and despite my physique and dress being better than most the guys there i had no confidence to even talk with strangers and just stayed silent and chatted with my friends until we left.

On our way to a park our car was playing loud music and my friends were raving in the car. I enjoyed the music but I completely didnt know what to do despite wanting to get it on it. I couldnt feel the beat or anything to start moving i just sat there awkwardly enjoying it.

I did try a bit but I felt like a guy struggling to stretch to touch his toes compared to another one flawlessly doing it.

I do want to loosen up and have fun but i really dont know how. I have nothing when i try to just go with the flow and i feel stiff when i go to nightclubs or bars.

Highlight of the night i had my first tequila shot and that was pretty wholesome