Honestly, I can't relate to this at all. I am so secure in knowing where I want to be in the future and what I want from life and feel so comfortable with the fact that I have backup skill sets and don't have too much pride to scrub toilets if I have to to pay the bills, PhD or not. Most people I know had no clue what to do after college, but I had known for years. Goals are so so so important to me that even though I was giving up a life of "cushy" desk jobs and use of a skill set I have developed-- business management, I haven't doubted it for a second. I know it can be hard when you see people able to do things financially you can't, but if you have good friends, they'll be understanding and make activities financially inclusive for everyone. Besides, employees are more disposable than ever before; I doubt any of them has true job security, and unless they are fiscally responsible, they may have no money in the bank for a rainy day. Just something to think about. Besides, you make friends in graduate school and they understand your limited time, energy, and funds-- you will be okay =). Once you get there, if this is really what you want in life, you'll feel so thrilled with the opportunity you have to be there, you'll be laughing as you get to research something you love and about half of your friends are miserable in their jobs.
ALSO, most importantly, when you look at people's social media pages and all, you are seeing their highlight real, not the full picture. Don't ever compare your day to day with their highlight real.