Something I did to help me with some of the feelings like "nobody cares" is when I'm in a good place and thinking clearly I made a list (I love lists) of everyone that I would like to come to my funeral if something happened and I died.

I then transferred that to the thought of "they would come because they DO care, I am loved." All those on that list would be deeply hurt for a long time because I matter. I have a purpose even if I don't know what that purpose is exactly.

I transfer that list then to a new list of "people who care" and picked out the three closest to me and put down their phone numbers so I can call them when I'm in a bad place. I told them that I have bad thoughts sometimes and they've told me that if I need to I can call them day or night. One family even told me that I can come to their house and hang out in their living room if it keeps me safe. I love them so much and they are the ones that I try to think of when bad things go through my mind.

Do you think you could do something like this? Even if your answer right now is "no", try making a list and see where it takes you. Talk to the people on that list and know that they do care and many of them might surprise you with their own stories.