Sudden Back pains

So during the week I stay home all day. I was in bed watching tv around 12:30 - 1 am. I got up to use the restroom and get a drink. I sat down on the bed & stood up to turn off the light & my back started hurting to bad. My lower back, and it just hurt so bad I layer back done until I could work up the power to shut the light off. I am only 15, and I weigh around 165 and I am 5'5 I am a decent size so I will post pictures if it might help, but overall I have no clue what's going one with my back. My mom works all day so I don't want her to take work off unless it's super important. Does anyone have an idea of why this could be happening or what it is causing this ? Thank you in advance !