When i was 12, i fell backwards off a fast skateboard & directly on sacrum which hurt bad. today i have a bulging disc & scoliosis. did it cause that?

Hard to say: If you had an x-ray 6 years ago after the incident it might show normal findings or the problems, but acquiring them from a simple fall would be unlikely.If x-rays now show scoliosis & a bulging disk, but did not then, you again cannot blame the simple fall for the change. Scoliosis often comes out during the rapid growth years of adolescence.The cause is usually unknown.