I’m also sorry that you have to go through this. It’s painful and sure it undermined your confidence. I have gone through a similar situation more times than I want to remember.

I share with you the same issues, anxiety and depression. And my shyness and introversion don’t help either with social interactions.

Be proud of yourself for trying to have friends and interact with people. Many of us, renounced this.

The most likely is that it isn’t your fault. People value different things over others as to hang out with others.

I have noticed I’m not fun enough or talkative enough for many people to feel
confortable with me and that affects the other way around, I begin for this reason to also feel uncomfortable with them and feel myself different and an outsider.
But, I’m sure that if you keep trying, you will probably find people who value you. It’s not easy for anybody but much less for us.

Before giving up with them. You could try the suggestion you were given about planning specific activities.

Do you have clues that they have been hanging out among them without you? It’s also something to take into account. Maybe it’s not the case. I don’t know it.

I wish you all the luck in the world because I know how you are feeling.
Thanks for sharing!