totally normal. both my corns act all aggressive or jittery when i go into the cage to pick them up. after i get them in my hands they calm right down and stop trying to get away.
let your chill out for a week or so if you just got it. then start picking it up for a bit each day till it gets used to you. if you have to, tap on the glass or use a stick to distract it while you pick it up with your other hand.
if it does strike at you, do your best not to jerk away. it can hurt the snake.