between being pessimistic and realistic

there is a difference between being pessimistic and realistic. pessimistic means we've given up in advance without any effort or even without the intention of trying. while realistically we are looking at relita there and see little possibilities. with the little possibility, we do not necessarily give up or back, but keep moving forward only with more rational thoughts and expectations under control.in life, we must always be realistic. well, let's say there are miracles can happen any time. but in some ways, we have to be realistic and determine the attitude we should take. so, if now I'm being realistic, I'm not wrong, isn't it?