Beta readers are essential to authors. These are the folks, usually fellow authors or existing fans, who read what you THINK is your final draft and point out why it’s not. Of course you need to brace yourself for some criticism. One way to deal with that if it really bothers you is to see your beta readers as team members, pre-editors if you will, who will help you perfect your product.
You may not agree with all their suggestions, but they’re worth considering. It’s always interesting to see if your readers are going to get any point you’re trying to make or not. They can also help find typos and other grammatical issues, like misused homonyms.
If you’ve never been a beta reader, offer to do so for an author friend or favorite author. Besides being a great way to network and make new friends, you’ll be surprised what you learn along the way. When you find something that really sticks in your craw as a reader, be honest about whether you may be guilty of the same faux pas.