My opinion
fellow=
A collection of people and what you are aiming to common, such as school and work at the same time
friend=
I want to be with people that seems even after you have finished school or work
I'm poor at English.If you can't understand what I mean, please let me know.Sorry for any inconvinience I may cause you.
私の考え
仲間=学校や職場など共通することや目指しているものが同じとき人の集まり
友達=学校や仕事が終わった後にも一緒にいたいと思える人
英語が下手でごめんなさい。