I think about the worst
I always think about the worst that can happen between me and a girl I like. And I mean the worst possible thing that could happen and destroy me emotionaly if it happened. Just making up stories like this, about getting betrayed, dumped, rejected, in the most horrorfying way, I get... depressed, but only until my mind wonders off somewhere else. And it pisses me off because these thoughts I have make me wonder "Does she really love me?", "Did I do something wrong?", ECT.
I wonder if I'm the only person like this, and also how can I fix this mentality. Is it normal?