a poser
A poser is a fake who tries to look important just to get people to like them. They usually don’t have any real friends.
You’re a poser for trying to be a DJ when you can’t even play a song without messing it up.
You’re a poser for pretending to be a basketball player when you can’t even dribble a ball properly.
You’re a poser for trying to be a influencer when your only follower is your mom.