I feel left out of everything. I was looking at pictures of people I used to know and they seem so happy. I feel blah.

The strength of a few can hold this world together. The walk is long and painful yet necessary. Change is constant, inevitable. Stability is the key.
You can't always get what you want, it is childish to believe otherwise. I grew up years ago. Maturity met and soul aged. Life is worth living and enjoying. Let no one make you feel as if your life is worthless as if you have wasted something precious. Live how you feel. Live your happiness.