Why does my tailbone hurt even if i didn't fall on it? i play soccer. i also get a weird sharp pain shooting through my left leg and everytime it hurts at a different place. it sometimes comes when i'm running or walking but it happens only sometimes?

It is not feasible to provide a meaningful opinion without additional history, physical examination and may be some tests. It would be prudent to see a doctor. Start with your primary care provider for an initial assessment and to ascertain if you need to see a specialist. Wish you good health!

It could be many different things such as remote trauma nerve issues or muscular in origin. If it is limiting you, see a doctor to work up the issue.