I believe I have something seriously wrong with me? Please read?

I have always been a worry wart but as a kid never thought much of it. I always worried about something and I never believed in things being perfect. It started to get worse when I was 16 when I was obsessed with death and feared dying at a young age, I still do but it's not as bad as it was before. In 2011 I went through the worst break down ever. I kept having horrible thoughts such as "What if I hurt or kill my loved ones" it started after watching supernatural.It got so bad I was too scared to go down stairs or be around my family because I thought I would snap and try to hurt them or attack them. After about a month or so it went away and all throughout 2012 I was fine never had a gruesome thought at all and I was completely normal. Now they are back but not as distressing as it was then because I was nearly having panic attacks and I was crying. My mother let me talk to her friend who is a therapist and she said it was nothing to worry about and I was gonna be okay. I was for a year but after looking at the case of Jodi Arias the thoughts are back again. I keep worrying what if I end up like her. For a while I worried I was a psychopath or sociopath and I started questioning whether all the tears I cried or things I felt in the past were fake. I don't think so because last year when I thought my father was deathly ill I cried for days until he told me he was okay. I remember a while back I cried at the thought of going to my parents funerals in the future because I can't imagine my life without them. Now I am questioning my sanity again and whether I will end up as some psycho. I don't really get out much because I have yet to get my license and I have no friends where I live. All I do is sit in the house and watch tv and stay on my laptop all day. I have been taking mental quizzes and looking at symptoms all day and it is making it worse. Before I read what a sociopath was these thoughts were causing me so much distress I cried. I notice these symptoms flare up around the time of my period(now) I am questioning my emotions and whether they are real. Please help me I feel like there is something really wrong with me and I just want to feel normal and happy again. I was not a abused as a child nor neglected, never tortured animals but did try to physically hurt my little brother when he hit me or just for no reason when I was around 10 but I never did it often at all, those actions are making me think I am a psycho.