This is post-worries in social anxiety. I have that too from time to time (it's hard to deal with)...but lately there have been a change in me, where I simply do not care any longer.
Most people have this built in more or less...but not as extensive as in maybe social anxiety. But if you would dig in their subconscious you would find that most people think about this in some level.
This comes from our ancestors. If we didn't where liked in the group, there where a risk of being left alone away from the group = death. So we needed to be liked to survive. But this is not valid in todays world, becouse we do not know everyone we meet on a personal level, and we do not need to know them in order to survive in the society.
Most people are in their own mind most of the time, and do not think about you as you are thinking about them. When you realize this...you can start to let go of this. I know it's hard, but it's possible. When we worry about what everyone else are thinking about us, it's most likely that we try to mind control them in a strange way. There is no way we know what others are thinking about us. We most likely are putting a negative image on ourselves doing this.
But I believe this behavior comes from trauma.
It's in our mind this happens. I believe it's a thinking pattern from our past life (trauma; like getting abused as a child) that messes with us in the present moment.
A mind hack I use to get around it is that, nobody knows who I really am (I don't even know

= we change from moment to moment, because we are evolving as a person), or who I was in the past. They only see me for who I am in this present moment. All this can help you to let go of the social anxiety. They can't hear your thoughts, and you can't hear their thoughts. So their version of you is you in this present moment. You are enough as you are. My belief is that social anxiety is us trying to please everyone else, in order to be perfect to them. But perfect do not exist.
Cognitive-behavioral therapy is a good therapy where you get help by professionals, to help you correct your behaviors, and therefor impact how you feel about yourself in relation to others. The key is to get out of your own head and see other people. Really see them.
About your hair loss. I kinda know what you are feeling. I had let my hair grow long, and I just shaved it away. But I know it's just my perception of me that's messed up. I have shaved my head in the past with no problems, so I will adjust. Not the same as
you have...but I believe I'm sniffing on the same feeling. Before this head shave, I was shaving my head 8+ years.
Maybe there are something in you that can't accept yourself and truly love yourself. My guess is that you are looking good in that bald look, but you are the only one that sees the bad in it. With a bald head you look bad ass, especially if your body are muscular and fit. Maybe you can work on that instead.
I believe this channel can help you.
I'm just trying to help and maybe help you see diffrent perspective in all of this.