I was always rubbish at all sports at school, and was told by family that I was no good at it. It takes a long time to realise that you can do anything if you put your mind to it - I completed my first half-marathon in March and still can't believe I managed to run the whole thing!
BS, you've done the first - and hardest - step, now just keep going and keep enjoying it. Oh, and try not to use negative words like waddler or lardy - you're a runner now, keep remembering that!