I too wanted to welcome you to the HW Forum, it is great having you here.
As you have mentioned in your post, your symptoms must be affecting your life to a certain degree. We are not here to give you a diagnosis, but to give you support where needed. You said you didn't want your parents to be stuck with a bill, and that is what is keeping you from seeking help. That is perfectly understandable, but bipolar or not only a licensed professional can give you a diagnosis.
You mentioned in another post that you are attending a college/university. They usually offer their services for free to current students, that might be a great place to start. Please let us know what you decide to do.