Can someone explain what is wrong with me?

I don't think there is anything wrong with you! Anger is totally normal. Instead of yelling and being mean when you are angry, try to communicate as nicely as you can that you are in a bad mood and that you would like some space or a few minutes to gather yourself. Don't stress out about finding a reason why you are mad right in the moment when you are mad, because it's harder to think clearly when you are mad. Instead give yourself some space and do something fun that will help get your mind off your anger. Giving into your anger just escalates it. When you are calm, think back to when you were angry and see if there was a reason. If there was a reason then communicate this to your mom or your girlfriend (when you're calm), if there wasn't a reason, that's okay. There should also be counselors at your school that you can talk to if your anger and relationship problems are really becoming an issue for you, they have lots of resources that can help you. I hope this was helpful! ^_^ Take care.

Nothing is wrong with you, as people get older hormones are released in your body that make you have random mood swings like that. Things like it happen, although if it's happening a lot you may want to consider the fact that you MAY be bipolar. That's only if you are still having these mood swings a lot more frequently or after you have exited the stages of puberty.

There is absolutely nothing wrong with you. Hormones are the worst, and are definitely the answer here. Don't worry about mood or mental disorders, the fact that it's only sharp spikes of anger and not random ecstasy, exhaustion or sadness shows that it's probably just plain irritability, something that's hard to avoid, especially at 14. What will help you most is sleep and space. You and your brain need time to recharge, almost anything can be put on hold for that. And when you're in one of those moments, try to communicate it to the person rather than use it as a destructive force. You'll find they may be able to empathize. Good luck!

A lot of people are saying there's nothing wrong with you, that may be true, but you only shared a couple of instances of this happening. You also said this happens at other times besides after naps. Usually when people have a short temper like what you describe, it can be a result of feeling hurt or being under a lot of stress. You're at an age that can be difficult for most people, it's typical to become depressed, it's typical for hormones to rage and make you a bit moody, school can be stressful. Based on what else is going on in your life, your capacity to handle stress might just be diminished to the point that tiny things can set you off. I think you should consider everything that could be a contributing factor, have you been hurt emotionally? Are you under a lot of stress? Are you depressed? If it's really affecting your everyday life in a negative way, then perhaps it would be a good idea to see a professional to help you sort things out.

find some things that relax you. meditating 20 minutes a day, reading, listening to music, running, deep breathing

Perhaps you are burying whatever is the true source of your anger because you don't want to deal with it or you are not currently aware of what it is. That can cause people to snap at others when they have unresolved anger inside of themselves over something else. So find out what it is. Just think about it.