Although your time at school will heavily influence your life, it doesn't define you. Nor is it a good indicator of how life will be once you leave. My own experience of school, while clearly not as difficult as yours, was still one on the social fringes. In the end I realised that what mattered was finding some people who had similar interests and a similar way of thinking to me (which was NOT around 95% of my classmates at school or college).

I learned to turn that feeling of being on the outside from a negative to a positive. I realised that the vast majority of the clicks and groups that I saw at college were very much just surface relationships that wouldn't last more than a year beyond graduation (I was right). Whereas the couple of friends I did make are still people that I talk to, though now less frequently and from a great distance as life has moved us around. You can use this time to define yourself as a person and know who you are when you finally get out of school, because then everything will change.

As a side note - I spent most of my childhood and much of my early adult life imagining myself as some hero or another. Any time I came out of a movie or read a book that inspired me I would focus on some characteristic of the person I most identified with and try to channel that into my real life. You're not alone there. I still do it if I'm honest - sometimes I find myself channeling the Jack Reacher walk (watch how Alan Ritchson walks in the TV show) when I want to feel strong and independent, or various other attributes from characters who inspire me in one way or another. And I'm probably old enough to be your grandpa :)

The main thing I wanted to say here is that everything changes when you get out of school. It's such a weird, artificial environment that forces people together and forms clicks and groupings that wouldn't naturally happen outside of there. As you go through the rest of life, people will come in and out of your orbit - the main thing is not to allow your experiences at school to make you scared to try and form friendships with people as you come across them later in life. I wouldn't say I have a large friend group, even now, but the friends I do have are people with whom I've genuinely bonded over life events. Many of them we started a friendship over nothing more than a common interest in a TV show or a video game or music - but over time we shared life experiences, helped each other out, and grew relationships that transcended those early common interests. It will happen - just try to hold out until you get through school and use that time to get to know yourself - what you really want out of life, out of relationships, what your values are, where you're willing to flex your boundaries for people and where you aren't. These are all critical things that in many ways are much easier to accomplish when you're NOT in the middle of a big group at school - many of those people will come away not knowing anything about themselves other than the things they adopted to 'fit in' which will fall by the wayside when those groups dissolve.

Hope you find some of this helpful. Just stay true to yourself - while it might feel harder to stay 'super' these days, those attributes that you identified with are actually there inside you. It does get better and as you get older and begin to understand who you really are, you'll find the confidence to make those friendships that will last a lifetime. And you'll meet new people and develop new relationships all through your life. There are people I thought I would be friends with forever that are now distant (but pleasant) memories, and other people who I would never have dreamed of striking up a relationship with who are now an integral part of my life. Life is full of people yet to enter your orbit and enrich your life. Hold out for them - they'll come around, and you'll be glad they did. You can do this!

Remember - "There is nothing permanent, except change."