This is a good read,
I share some of the same fears alot of you folks have.
Being 25 yrs old when I started out, my biggest fear was "I wonder if they will even take me seriosly" You see, not only was I young, I had braces and a baby face, so I thought a seller would never believe "1", a mere kid, would buy there house for cash.
Then, I said the hell with it, I took massive action, I displayed confidence, and boy was I wrong....I found that my age, or looks had very little barring on getting deals. My confidence spoke volumes and the deals came poring in, and the rest is history.