Happy yet sad to see there are others that do this

I think this also goes hand in hand with thinking that everyone is judging me. It's awful! I remember, at one time, when I used to genuinely not care what others thought of me. I loved who I was, didn't care how I dressed, didn't mind that I would say silly things. I didn't care because I knew I was a great person.
I think that now, I dont think im a great person and I dont love myself anymore. Im not sure how to get back to that point.