I'm 17 and have a flight to see my family. My parents work the day of the flight for United Airlines will I be able to check myself in without parents being there?

Yes, you will ! As long as you go through the security check point your good 🙂 12 and under just need to have a parent consent ! Your old enough to fly by yourself 😉 Have a safe and nice flight ✈️

The best answer is for you to call the airline

Yes. I think so. Can't imagine you having any issues checking in. Bring your State ID just in case.

Yes, I am sure you can check without your parents as long you you have a valid ID. https://www.united.com/ual/en/us/fly/travel/special-needs/minors.html There is some information here.