How do I tell him??

Me and my boyfriend/baby daddy have been dating for 5.5years. We’ve been living together for 6 months (since my daughter was born) and it’s been tough like every other relationship but we’re working on it. However..... he’s ALWAYS using my things( my deodorant, my conditioner, my razors, my protein shake cups) I don’t know how to tell him to stop!!!😩😩😩 Any suggestions on how I can nicely say buy your own stuff?😭😭