I have very, very thin hair. I was born with it. What can i do to add volume without using heavy mou

i have the same problem, very fine, thin hair. I got a really cute funky short cut, then i blow dry it smooth and have just kind of learned to accept my lack of volume and found a style that works for me. The back is really short so I can spike it up with a gel or pomade. The front and sides are longer and i keep those smooth. I suggest you find a style that works with your hair, it took me 22 years to accept my hair and find a style that works, but it really makes things easier, i finally don't HATE my hair!