Could I have OCD??(I feel like a weirdo...)?

You have OCD. You're not weird or crazy. You have some simple misfiring of neuro-transmitters in your brain. Just like a diabetic needs insulin, you need some medication and therapy to ist with this. Many people have this and just like going to a doctor for a broken bone, you need one for OCD. Also, you sound very smart and are doing great by being able to describe your symptoms which will help your doctors treat this easily. Getting some istance will improve your life and you'll notice that you feel much better sooner than you think. Also just realize, your thoughts are not reality (as far as getting a disease or feeling like you'll die) and medication will enable you to be free without paranoia and anxiety. It will also improve your concentration and grades. You're doing great hon.