When it comes to friends, especially as a teenager when everyone is trying to find who they are and what they want to do in the future as well as all the pressure from society, we can loose friends, separate from them or have a personal issue with them. Sometimes if your in a strong group and you're the only one who doesn't like this friend or it is hard to separate from them even if everyone has a problem with them, it can become more of a problem, especially if you're facing this person almost everyday.
What is important to know is that these friends don't have to be permanent and you don't have to like them. We have to respect who they are now, even if it is just a phase, and may be easier to just slowly un-involve yourself with this person if you don't want to or is hard for you to be around them.
Don't try to change this friend, they might have their own reasons or it just happened and they might not be aware of it. If you wish to speak to them, then do so but don't try to change them back unless they are affecting their health or something similar and even then try to make them aware of who they have become.
As I have said, you don't have to be friends with them forever, find people who you get along with and are happy around. As selfish as it may sound, it is important to put your own happiness first and do what's best for you. A quote that I think about a lot is "Do what you like, love what you do" by Bang Yong Guk of B.A.P. This quote is mainly talking about what you want to do as a job, but I like to interpret it as do what you like with your life, love what it is that you do.
I hope that any help needed and any advice for the future was given
Hope it was helpful
- Zin x