My parents/family can’t help me move in the day I’m supposed to move in. Is it okay if like 2 or 3 friends help me move in?
Of course -why not?
Sure it is.
Just be sure to include your roommate if you go get something to eat after, etc. so that you can build that relationship, too.
Building upon @TQfromtheU 's comment, definitely go eat afterwards and TREAT YOUR FRIENDS. That is what you do when friends help you move, whether it’s in a dorm or your first house. And, yes, including your new roommate would be a great move.