How about I do something without my friends?
Why do you want to do something without your friends?
I want to do something else because I really want to do something interesting by myself.
Yeah, I hear where you are coming from. Sometimes you just want that alone time and do stuff by yourself and relax. Otherwise, it's too much pressure and hard to breath when you are always with friends which can get exhausting.
I just want to do something alone because I feel they are too controlling. I want to feel free and be alone. I mean who cares.
It is fine to sometimes be alone and you are right that I don't think anyone would care. Doing interesting things by yourself can be fun, and I hope that you have fun doing it.