I feel stuck

I (28F) feel stuck and I don't know if I can forgive myself if I leave.

I was rarely home up until covid and when covid hit, I moved back into my parents house in my hometown in the suburbs. This was fine at first since my close friends lived in the area and it meant I could be near my dog that my parents had been caring for.

Two years ago, I moved out into my own place in the same hometown to be nearby my parents and my dog.

For context, I had a rocky relationship with my parents but have since repaired things and we are all very close now. My dog is more of the family dog that we adopted when I was in high school but I consider him to be my responsibility since he was my idea and I have covered his pet bills ever since I got my first full time job during covid.

For the past few years, I have been feeling "stuck" and since turning 28, it has only gotten worse. While my little sister has been able to live her life in different cities and go out, meet new people, I have felt an obligation as the older sister to stay home and help my parents and take care of my aging dog. And I feel like Ive wasted away my twenties, sitting at home and going out once in a blue moon.

I basically have no friends. The friends that I thought were my friends are people Ive realized dont really care about me.

In the past few years my dads health has worsened and in the past year, he has been in and out of the hospital.

At the same time, my dog was diagnosed with stage 2 cancer. This dog has been in and out of the hospital more times than I can count. And I cant move this dog with me. It would be cruel to move him out of a large house and yard and into a tiny apartment, especially during what could be his last few years.

I signed a new lease this year and Ive been at the new place once to move in and basically havent been back because Ive been staying at my parents taking care of my family.

So I feel stuck. On one hand, I want to stay and help but on the other hand, I feel like Im wasting away my twenties with no friends, no partner. Im depressed as hell - what would you do if you were in my situation?