Apparently I must have sprained my hip a few years ago, possibly in my late teens. Due to hypermobility, the healing has been compromised and instead the muscles have kind of locked it up, so the one side of my hip is less flexible and regularly subluxates (partially dislocates) while walking. I only realised all of this when having a free consultation with a chiropractor, and thought the pain was just me being over sensitive or something.
If the injury takes a long time to heal, or places feel sprained for months/years then it's a possibility you suffer from this.
It sounds silly to wait so long but after being brushed off a few times you just assume the pain is normal. Never do that; you can cause permanent damage. I'm facing the risk of there being permanent damage and am waiting to see if my GP will refer me to a specialist to check everything out, and I'm merely 21. Eek!