NEED help with new burm

[blue6]

Hey I have a Red tail boa and a ball python and they are both really nice snakes they have never tried to bite me or have never hissed. Just a few days ago I got an albino burmese python for my birthday. He is about 2 and a half feet long and maybe 5 months old. I got him from the same pet store I got my ball python from and my ball python is the nicest snake I have ever seen, but the burm that I just got seems to be pretty aggressive. I was holding him in the store and he just seemed a lil scared so I thought no big deal. But when I got him home I waited a day for him to chill out and then the next day when I went to pick him up he started hissing. I slowly got him out of his cage and he was doing ok but still seemed really nervous. About 10 minutes into holding him I moved my hand and he lashed out and bit my chest. ( I didn’t have a shirt on so he drew some blood) I was going to put him back into his cage and he bit me again but on the hand.
So I was wondering what I should do. I don’t know if I should take him back to the store to see if I can exchange him for one that is more nice because I do not want a snake that is going to be 10+ feet and bitting and aggressive. help