I think it's important not to compare yourself to other people on Facebook. Facebook does not always represent reality. (Same thing with Instagram, Twitter, etc..) For example, if you took a photo of yourself, would you put it up on Facebook if it looks awful? Probably not.

People always want to make themselves look good on the internet, so they're only going to post "the good" and rarely (if ever) post "the bad". Anyone can clean their house, take a photo, and upload the photo to Facebook. Does that mean their house is always clean and nice? Not necessarily. Also, anyone can spend endless amounts of money on expensive things. Does that mean they can afford it? Not necessarily. Some people are very poor with money management and they only care to show off.

I just think you need to consider those sorts of things. Logic your way through it.

No one's life is perfect, and like venusss said, there will always be people better than you. Don't fret!