Each Dragon Is Different (EDID). Some, like mine, took months to tame down. Any time I'd reach into the enclosure, I'd get bearded, gaped at, hissed at, and/or bitten. Getting bit is no big deal when they're little, but once they put a little weight on, they can do some damage.
It's natural for these little guys to be afraid of us at first, especially when that young. They're one step above the very bottom of the food chain. Aside from the bugs they hunt & eat, almost everything else in their natural environment is a predator trying to eat them, so taming/trusting goes against millions of years of evolution.
Some Tips:
1. Patience. Hopefully, yours won't take as long as mine did, but you can't force/rush these things. It may take some time.
2. Consistency. Slow non-threatening motions/movements--never from overhead.
3. Resolve/follow-through. If your dragon runs away, or otherwise acts out, don't get angry/frustrated, but don't let them get away with it, or they'll learn that behavior will put you off. If you're going to pick them up, you're going to pick them up.
4. You will make mistakes--we all do. Don't Panic. Give your dragon some time to calm down, and start over.