A few days ago i started feeling sore, tender and burning at my old csection incision area, its mostly center and left side, the burn feels like an open wound kind of burn, my csection was 5 years ago, i feel like i've had another csection but havent?

It is possible that you have a post-incisional hernia. That is where part of the gut and/or the connective tissue attached to it has been squeezed into the tissue planes caused by the old C-section incision and are now trapped in the scar—leading to poor blood flow there and possible infection. Please see a trusted healthcare provider to rule-out this dangerous condition and other serious ones.