When I played (retired at 32 due to injuries), I played all along the back 4. Primarily left or right back as I kick as well with either foot.
Played semi-professionally in the South West of England for many years, just missed my chance to go professional due to a very timely (bad timing) ACL injury which sidelined me for a season, trouble is my first game back after that injury I had a bad tackle on me which broke my right ankle, this put me in plaster for 6 months and I never recovered sufficiently to play at a higher standard. This injury also gave me arthritus so pretty curtailed my visions of playing for Arsenal (LOL).
My strengths when playing was that I was a pure defender, I didn't care for scoring etc, I was also very, very fast so was usually the last line of defence. I was also very talkative and was forever making sure everybody knew their job and what was happening around them, this more often than not meant that I played as captain also. Weakness was that I was not the most skillful player on the pitch, no clever flicks and tricks from me, I did my job which was to stop the other team scoring.