It sounds like you are feeling so much pain. My heart truly goes out to you, so very much.
It's a horrible feeling, to feel invisible. It can leave us with so much self doubt at times, that's for sure. You can be left doubting whether anyone really cares, you can be left doubting you're here for a reason and doubting that there's any kind nature left in anyone anymore. So much doubt. It really is horrible. It's so hard to maintain faith in yourself when there's so much doubt.
Finding the people in our life who have the ability to remove this kind of doubt from our mind can definitely be challenging. It can be hard to find such people. Personally, I only have a few key people in my life like this (which I'm fortunate to have), the rest can lead me to feel full of self doubt, really testing me at times. The rest can lead me to feel like I'm the odd one out, the difficult or stupid one, the slightly crazy one or weird one and I've come to understand it's basically because they don't appreciate me for who I naturally am. Other people can have a lot of faults in them, that can lead us to self doubt. It just doesn't seem fair, especially when who we are is someone incredibly special.
Can you think of the sort of people who would not lead you to self doubt? Unicorn, for me those people are mind/body/spirit sort of people. I admit, I'm lucky there are so many more of them around these days. I can even go to one of those body/mind/spirit festivals and find thousands of these sort of people there. I feel at home, at one of those festivals. When I step back out into the world, it can feel pretty challenging. For me, I find people who are more natural or soulful are less egotistical and superficial. They are more sensitive, more open minded, more accepting and more inspirational. It's amazing how many people we meet in life who are insensitive, closed minded, unaccepting and degrading. I figure, no wonder we can be left with so much self doubt.
My wish for you is that you find more soulful people, people who will one day lead you to say 'I can't believe the kind of people I used to associate with. No wonder I was left feeling so down at times'. I have no doubt you're an amazing person Unicorn. Finding those who really see us becomes our challenge in reaching the point of no longer feeling invisible.