I'm feeling the same way. I discovered this website after submitting most of my applications... seeing all the posts on here makes me wish I applied to more reach schools (Stanford, Berkeley, Yale, Harvard, etc..), my only two are MIT and Caltech. But it definitely feels good getting acceptances! I think if I applied to all reach schools that would not be the case right now...
But the schools you've been accepted to are nothing to sneeze at either! Especially UT, UNC, A&M etc, all Top 20 or Top 10 among certain subfields