Had a problem similar to what you're describing until a few months ago. I thought it was muscular and kept ignoring it for about a year until it was too difficult and painful for me to walk. Turned out my spine was a mess, stenosis, spondylolisthesis and herniated discs. I've had the first of what will be multiple surgeries and the relief from day one has been astounding. I was lucky and did not suffer any permanent nerve damage. Please don't do what I did and ignore it.