Why single mums are really super heroes.The life of a single mum can be peppered with self-doubt. Always worrying if you’re a good mum or not. Whether you’re doing everything right. It saps your strength. Sort of like Superman’s Kryptonite.Just the other day I was chatting to a close friend and single mother to her grown-up son. She admitted that, even now, she still has uncertainties. So one day, whilst crying into her proverbial milk, she asked her son about…