Am I overthinking this Bipolar thing? Should I just go get it tested at a clinic? What will the tests include?

Dont be so obsessive , this is something that is very manageable to live with .
If you think you are and its out of your control , i would forsure see a physiologist.
They will test you by asking you a bunch of questions , just about your certain behaviors and your
responses will determine if they think you have it or not. If you do, you will be put on a medication that
will help you be more regulated and happy.

Teenagers have fluctuating hormones which cause mood swings. It has been normal since time began. Nowadays you all WANT a label.