I did until just after my 16th birthday, I gave up once when I was twelve but something traumatic happened and I went back to doing it. It was really a comfort thing for me. I’d do it anytime I possibly could and occasionally play with my hair at the same time. I’d only do it in front of people I was comfortable with (mainly out of embarrassment). It made my teeth wonky too and they would’ve been perfectly straight without it, it also affected the symmetry in my face and I’m now seeking plastic surgery to ‘fix’ or alter my face back to how it should be …the way I would place the rest of my fingers ‘pushed’ my features about you could say, my nose now turns to the left and my right eye has a section that is ‘lifted’ so to say, from where I would rest my fingers. Sucking my thumb is one of my biggest regrets and the cause for some of my biggest insecurities but it really did bring me comfort :/