Am I paranoid or overly-creative?

I'm 14 & I'm starting to think I may have a problem. When I think of something, I stop immediately & start to tense up or smack my face because I'm sure someone can hear me or it's completely asinine. I've said something or thought it & just stopped. Sometimes, I slap my face to try & wipe it from my memory. I also get mortified when a storm occurs, the thunder & the Lightning cause me to go into this spastic state, where I start crying & Get into a ball position. Everyone in my family is embarrassed by it & if I know a storm is to happen when I'm somewhere, I have to immediately come home. I tend to make scenarios up in my head, alot. If someone in a car drives by my house, I'm assuming they're coming to kill me. If I see the headlights of a car in my house, I start to get the jitters thinking someone has a flashlight & is peering into my house. I see shadows sometimes as dark evil things that want to hurt me. I hate being the only one awake at night, because I have to rescue everyone if there is an intruder. If I'm the last one awake I start to go upstairs, but I can't stay there, because what if someone is downstairs? I also freak if no one is home, because what if I said something & it came true, which brings me to my next point.. I think that if I say things, they will literally come true, & I've been extremely careful about what I say, since recently I was at a BBQ & I asked my parents for a new pet, and said because my cats are gonna die soon. [One had ran away the week earlier] & When we came home, I found my cat, dead on the side of the road. I also tend to be extremely happy for like 2 days & the next day I'm depressed & don't want to talk to anyone. Is this just something that happens when you are a teenager, or am I just manic or something?