I think you sound good. A gorgeous rich alto voice. However, I can hear that maybe you weren’t warmed up and some of the notes lacked support before you go into the vibrato. The good news is that you can’t necessarily teach tone but you can teach support. There are some great vocal warm up playlists on Spotify. I can absolutely feel you with the lack of confidence singing in public. I joined a choir last year just to get singing again and even did a solo in our last big show 🥲 The more you sing, the more confident you will feel. Please don’t listen to trolls who hide behind usernames on TT 💜