I have a bearded dragon that when I got he was a baby and chill. But now he runs away from me?

Also, baby dragons are unaware and cautious, meaning if you were to hold me, it would either look, climb, sniff, or lick you. Because its trying to get to know you. Adults already know what humans are like and might run away, unless well trained. I doubt you took the 4 months it takes to train them, am I wrong?