i'm scared of me being an overthinker

What if’s are my greatest fears, something I suffer through because I’ll never know the answer, what if i never met you, where would I stand? You go on again, and I say I know, because I never want to let you know what goes through my mind. You worry for me, when I tell you, but now it’s just a pity. What if we went back to the happy times, would I be normal? Would you love me if I left, what if you were happier? What if you found someone new? As she left, did you say anything? What if you loved her? Am I a substitute for her? I hope she comes back, so I’d be left in my head again, never telling anyone what I go through.