You do have an increased lordosis of your lumbar spine, however I would suggest it is postural. Your pelvis is in an anterior tilt (so basically making your bum stick out more), which naturally increases the lordosis of the lumbar spine. You probably will find that if you stand still for long periods of time that you get an achy back - because your back muscles are working primarily rather than balancing out with your abs.
To correct you can do a few exercises, lie on your bed on your back and practice squashing your lumbar spine into the bed to flatten out your back, using your pelvis.
You can also do this in sitting, by rocking your pelvis backwards and forwards, so really slump down, then sit up as tall as you can.
Finally, if you have an exercise ball/gym ball, you can sit on that and leaving your feet in front, shoulder width apart, move the ball backwards and forwards with your pelvis again, so your not pushing with your feet, just aiming for small movements from your back/pelvis.