1- You are a fangirl. You talk about him nonstop, you write fictional stories about him, you constantly change your signature to different pictures of him, you listen to his shitty side projects just because he's associated with them, you like fucking Captain Kirk because he shares the same name as someone supposedly close to him. You. Are. A. Fangirl. You don't have to be ashamed of this, but don't lie to yourself about it. 2- that was just me being mean.
Yes you're asocial, that much is obvious. But you're whining about how you don't connect with other people- see a professional about that, they will help you cultivate social skills. A therapist or psychiatrist on top of that would help you to understand why you do the stupid shit you do now, and help you stop doing stupid shit.
You obviously are emotionally underdeveloped, because no reasonable human would wish death upon someone that they loved (or upon a stranger that you obsess over). Puberty is fucking rough, I get it, I went through it too, but still feeling the way you feel into your 20's is a problem, and you should seek out a way to correct that problem.
And if you really want to get technical then you ARE crazy, because depression is a clinically diagnosable mental disorder aka "crazy"
He blocked you because you're a creepy fangirl, and you probably only wanted to talk to him about your ex and your bowel movements
Again, go see a therapist, or maybe you need a psychiatrist (cuz you seem to not have a grip on emotions and there's probably a reason behind that), cuz without you changing you're not going to be any happier or healthier