Age 15 and confused in life HELP PLEASE?

well you seem like an amazing guy and anyone would be lucky to hang out with you. As for you feeling isolated, you just have to find the right people to hang with. I always bounce back and forth between groups of friends on a given day because they can't always be where i am and vice versa (im in grade 9 so i get the whole "im so busy and i can't hang with the same friends all the time". So just be friendly with everyone and no one can accuse u of being hostile or not trying. As for your brother, i think hes just trying to annoy you. :D good luck <3