I think i have depression but it's not like what people usually say and i cant help but feel like i'm faking it, like its not real, bcs sometimes i'm happy but other times it gets bad and don't wanna see anyone or do anything?

I would share your concerns with your doc. In my practice I employed a simple Q&A screening device to help sort out the common stressed events of teens from those that meant more significant anxiety and depression. When needed I sent them to a life coach/therapist to explore the issues. You are at an age when these things do emerge. Go get evaluated.

It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!