Many writers wonder if it’s acceptable (by the publishing world) for a new writer to write their story in first person. First person is not frowned upon in either adult fiction or YA. There are plenty of very well-received books in both markets written in first person.
There are different tastes and reader opinions about first person. Some readers love it, some hate it, some don’t care either way.
For writers, the key is in whether you have the ability to make the story work well in first person, and whether or not your personal writing voice fits well in first person. Sometimes newer writers are encouraged to work in third person until they are more skillful, but it really comes down to execution of it. If you have a writing voice and strong skills that can carry a first person POV, there’s nothing to say you can’t or shouldn’t do it. You’ll have some people who will love it, and other people who won’t.
But that’s the case for everything we write. So it’s really a very personal, story-specific choice. Be free, and give it a try if you want.