becuase they send an email saying how many points i had but idk i wasn't an member yet so i was wondering if there was a way to get those points?
I would call rewards. They may be able to straighten that out for you, and apply retroactive.
This is something you'll want to discuss with Marriott Rewards Customer Service.
Visit https://www.marriott.com/suggest/default.mi for contact information for Marriott Rewards.