I am afraid your uncle is not going to understand a fifteen year old girl. This is unfortunate as he is your best chance of getting through and achieving. He is the only adult available to provide stability to your life. The first advice has to be don’t overlook that. It would be strange if you liked living under his regime. You are a teenager, you are expected to push boundaries, but until you appreciate what you have, I would say it is difficult to progress.
No doubt you do miss your mother, and you are probably home sick. Feeling isolated is not the most pleasant of experiences, arranging visits home, and/or for you mother to visit you I reckon would do a lot to help. In fact simply going away and coming back again does help to develop a sense of place and belonging. I would have recommended going to a youth camp, but I fear the season is probably over. However, a place away, even if it is only a day, I am sure would help.
My daughter has a place near home in a park where she likes to be. If you can find such a place because one of the things we all have to do is to come to terms with ourselves. What we are, who we are with God, what we are going to make of our lives, how we are going to cope with situations and so on.
Decide who you are and what you want to be. If you can do that it will be the best coping mechanism, because you will have a focus and a purpose for your life. I am aware that doing that is not always easy for everyone.
The next bit of advice may seem a bit strange. Don’t look for answers. This is what you are doing at the moment. Time, I am afraid never goes quickly. It just has passed quickly, which is a completely different thing.
Why do you want time to go quickly, because that would answer you problem. Don’t look for answers, rather look for opportunities, and then you can ask as many questions as you need.
Life is not easy for a person like yourself. Sometimes, when things are bad, we have to learn to live one day at a time. For a girl this usually means having friends, some one to talk to. That was another of your complaints that you have no one. But could you be someone for another person, could you make someone feel good about themselves. Often, all it requires is the ability to listen, without judging, and without providing solutions, and above all being encouraging. Looking away from oneself is also a good coping mechanism.