This is hard

While today has been a great day I can't shake this feeling at the moment that I'm not a real parent. So the fact is I'm not biologically but I feed them, bath them, cuddle them, put them to bed, look after them, take them on special outings, do activities with them, get up to them in the middle of the night etc. The definition of what/who I am is difficult and always changing. I'm finding it difficult today.