nausea after few hours of socializing

I barely socialize and I’m an introvert, I can Crack jokes, I’m honest but hardly get attached to people, I worry a lot of how I seem to others even though I can be confident. Today I went to my friends birthday and it was cool and all we went out and were walking around the town cracking up jokes and it was al cool, at 11pm I went home and now I feel nausea. The city was loud, I was sweaty, we went through a large crowd of highschoolers partying etc. but Its stil not it I’m very nauseous and feel gross and sticky I didn’t even overeat or anything I’m just kinda overthinking even though I told myself I’m confident and cool and should just shut up and stop overthinking cause anxiety is a liar and I look good and all but I never seem to get satisfied enough with how I socialize and how poeple go along and who finds a special interest in me I feel so lame bc of that idk lmfaoo