Yes, I passed through this too. I went to university and now due to shitty situation in country I'm having problems finding a job.
My mother was 40 when she made me, now she's 62 and the truth is, no matter how much I wish otherwise, even I can see she's starting to lose strengh and stamina. I don't have other close relatives.
I had some friends in my younger days, but they all either struck gold or simply forgat about me. I still remember them from time to time.
But now I have a great friend I met in university, better then all those other "friends" that left me for she's truly loyal and close to my heart.
Still until I found her, I felt similar to what you feel. What you feel is nostalgia. You see things are starting to degrade and how you've lost friends and how better it was when your parents were younger and in good health and those friends were there. It's ok, it's an understandable feeling. Despite what you feel now, you will truly grow out of it. Just get new friends, better friends, friends who are loyal to you and to whom you are loyal. Just keep looking, and you'll find maybe someone to love and bond together and see how your relation grows. Just find a job and as the years pass you'll see how you advance in rank and pay.
What you're feeling now is that moment when it's finally time to raise on your feet since you know parents can't take care of you anymore, now you need to start caring for them but it's a bit frightening and overwhelming since you don't know how you'll grow, what job will you find, where will you find the loyal friends and how, how will you know when you'll find the one and so on and you prefer to remember the good days when you didn't have to worry about any of these things.
As, I said, nostalgia. Don't worry, your road is just beginning and even if now it's a bit overwhelming, with work you'll see how it might take you to unknown wonders.