Without knowing what actually happened, it's very difficult for anyone to say whether your mother is overreacting or not. But here are a couple simple truths to ponder: 1) no matter how much you know you screwed up and want to change and not repeat that screw up, it is very difficult to change and avoid doing the same thing again if you stay in the same circumstances. A complete change of environment is difficult, but in some ways it will be much easier to develop a new group of friends that is hopefully a more positive influence. Not sure exactly how schools work there, but 14 in the US would be the start of 4 years of high school and that is a much better time of life to start a transition than to have to change schools just before your last year of school or something. It will get better and you will get to know people, but I'm sorry it's hard and lonely now.
Truth 2: Transition sucks, it takes time to build a new life, and you'll most likely be doing so for the rest of your life. I lived overseas for 3 years and just moved back home last Sept. In some ways it felt like I lost everything: my friends, my community, my church, the apartment I lived in, my favorite places to eat out and new favorite foods, etc. Soon I hope to find a job and then I'll have to transition into a new set of circumstances. And it can be a lot and overwhelming and how it affects each of us is similar but not the same. One of the best most productive things you can do at this time is start learning to transition well and get plugged in in a new community. That's a skill you will be using for your whole life.
Bonus truth: at 20, 24, 30, etc. you'll cringe at how much of a kid you still were at 14 even when you thought you were such an adult. We've all done it and we probably all hated how our parents made us do things we didn't want to when we were 14.
Couple more thoughts: please please please, save yourself the heartache and leave the boys alone until you are ready to consider marriage. Any guy you date you'll eventually either end up breaking up with or marrying and breakups are horrible.
Your surroundings will greatly influence the person you develop into; do everything you can to choose good influences