If you're vaccinated and don't have any serious health conditions, you should be fine.
With that said, if you don't live in a major city, you can probably get into a theater that has significantly fewer people right now than it usually would pre-covid days... Unless you're in the U.S who lives in a state in or near the bible belt.
>Just pick a show where most of the theater is empty. If all shows are crowded, wait a week or two.
I don't know of any theaters that have crowds anymore.