First of all welcome. Now to your questions. We are in no way qualified to diagnose what you may or maynot have based on a couple of small items you have written. That is where a qualified Pdoc comes in and works with you over a course of time to help understand what you may or may not have.
It's hard to say if you are BP or if you are just dealing with what many teenagers go thru, buying lots of stuff, talking fast and being moody depressed type people when they are down.
Trust me, i hope for your sake that you are just a normal teenager who is just having normal teenage things. You don;t want any part of this BP thing. Its a game and life changer and not allways for the better. If you really want to know get in touch with a good Pdoc and get started on finding the answers to your questions. At the very worst you find out you do have BP, or you find out you don't. Either way the answers that tell you want it isnt also help you understand what it might be.
Good luck Bill
"If Life Gives You Lemons, Make Lemonade"
"It isn't my fault that i am BiPolar, It is my responsibility how i treat it so that i don't hurt others or myself." Happy Bill
Meds. Respirdal 0.5 a day, more if needed.