At first, I thought creating an MC who was a version of myself was bad news: too easy, self-involved, embarrassing. Then gradually over time I accepted that both my female MCs are like me in some ways...well, a lot of ways.
And that's okay.
Write about yourself. Don't write about yourself. Either is fine. You'll probably end up doing both. This is the disclaimer: don't make the decision before you start writing.
You never know what sort of situations your characters will get themselves into. If you're a pre-plotter you might know, but you probably won't fully understand what moments in your life those events are based in. You won't understand what personal truths draw you to the fictional story. For most writers, the story comes and then they understand the core later.
Don't block your own experiences. If you can't stand the thought of people likening you to your MC, you will deny the things that make you similar. As a writer, you have to assimilate with the MC. You have to be sensitive to what they're going through. You have to empathize. If you make the decision that your MC will not be like you then you may subconsciously block the material you have to tell the story.
You need all of your life experiences available--as clay to the potter--to tell your story.
Don't decide. There are those writers who badmouth writers who make stuff up. They think fake fiction is not rich, unimportant...commercial. There are those who think writing about yourself is not challenging enough. Let all those other writers fight about it.
Be open. Let your characters carry you where they please, whether that be to a story you know nothing about or to the very heart of a memory that is deep inside of you.