I'll be different
I think I'll be different
I hope I'm not different

from The Weeknd – Rolling Stone Lyrics on Rap Genius

Meaning

He is sure that throughout his career he will change into something he does not want to.

The order in which he puts this is also interesting. At first he is confident “I’ll be different.” Then he re-thinks it losing confidence “I think I’ll be different.” Lastly, he is no longer asserting he will not be different. He is merely hoping “I hope I’m not different.”

He’s also playing along with the idea of talking the female.
Many dudes (especially the kind depicted as the narrators in Weeknd songs) tell the girl they will be different while tryna get somewhere with her but most end up being the same and hurting her.

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