ANSWER - There are a couple of questions in here and we’ll have a look at each of them in turn. Firstly you ask if it is possible for the energy in your body to manipulate electronics. The simple answer is yes, I know a lot of witches who report issues with electronic products failing to work when they are near to them. Some witches don’t even wear watches for the reason that the magnetism in the watch mechanism stops working after a short while. I can’t offer you a scientific explanation for this, just anecdotal confirmation that you are definitely not alone and that what you are experiencing seems to be a fairly common phenomenon among magical practitioners.
My own thoughts on this subject is that magic generates its own energy and this energy seems to disrupt other non magical energies like electricity and magnetism. That’s as far as my high school level physics takes me but I’d be surprised if the facts differed greatly from that explanation.
You seem worried that you feel out of control when having negative thoughts. Might be worth reading this answer where a reader was having similar issues.
I see a lot of concern in the modern magical community relating to the concept of good/bad. I suspect a lot of the “see no evil” New Age folk are to blame for this. I personally believe that we all have good and bad within us and that labelling parts of ourselves as bad and trying to repress them isn’t a very healthy thing to do. Undoubtedly you have bad in you, so do I, so does everybody else. A far healthier way of living your life is to come to terms with the fact that there are bits of yourself you don’t like and learn to live with them. (Interesting article worth reading here where I discuss Raven Kaldara’s monster theory. Read it - I think it will help.)
I believe it is not just possible but highly plausible that when we repress parts of ourselves we bottle up like a pressure cooker and eventually that negative energy explodes out in different directions. I don’t think it is your “badness” but the effort you are putting into negating this side of your character that is causing the consequences you describe in your question. My advice to you would be to view yourself as an imperfect human like the rest of us. Try to do the right thing by all means but accept you are not perfect and you will make mistakes. Taking the pressure off your shoulders to be unrealistically “good” will stop this inner turmoil and help you to relax. I think you’ll find if you do that your energies will stop going haywire and you will get fewer instances of things happening beyond your control.