Why do I have to do everything?

I'm really frustrated. For my entire life, I've been dragging everyone around, sometimes practically by the neck, to do anything; get-togethers, projects, family gatherings, work functions, book club, R&R, etc. For the past few years, I stopped reaching out to friends and family to focus on my own life. I still talk to them and visit on a regular basis, but I don't go out of my way to do these things for them anymore. Unsurprisingly, no one has lifted a finger to even contact me for the past few years.

I don't understand why I have to initiate everything. I've asked them to please call me or something once in a while, but it never happens. I've dragged a lot of my friends through hard times in their lives to success. I helped them at heavy cost to myself, but none of them have ever returned the favor, despite knowing I struggle a lot in my own life.

Now, I'm exhausted and depressed, my friends and family know it, and still I am ignored. It's like they forget I exist until I remind them that I do.