You are not alone but I thought I was there until I decided to search for answers and came across this. I also rock back and forth constantly but not in front of people only because I'm embarrassed but it's a comforting thing for me and have no idea why I do it or what caused me to Rock but I've done this as far back as I could remember my mom said I rocked as a toddler and said as a baby I loved my swing any time I cried she out me in my swing and I'd stop crying and that the only time I wanted to be out of my swing was when I was hungry then I wanted to go right back but now as a 24 year old I'm starting to question it kinda just wanna know if it's caused by some disorder or from anxiety anyhow thought I'd post and let you know youre not alone