standing still...

Sometimes, especially lately, I feel like I am standing still as the rest of the world is zooming past - moving forward.
I am always extremely happy for my friends when they're going through these life changing blessings such as getting engaged, married or starting a family of their own. But as all of my friends begin each of these things, I have noticed that I am quite far behind.
I find myself feeling hopeless and lonely. Everyone seems to be in superspeed and I am on pause. People I went to school with are happy with their careers, finishing school, married, getting married and parents... I don't even know what I want eat for lunch let alone what to do for a career.
It's frustrating seeing some people that I ignorantly assumed would go nowhere in life accomplishing EVERYTHING I want. I know what I want, and I want it sooo bad yet I can't find it.
Sometimes I find it especially difficult to be happy for some people, the ones closest to me I am genuinely happy for - because I love them and want them to be happiest of all... but the one's I am not that close to I find myself being jealous and wishing that it was me.... not them.
I know no one's life is picture perfect, and that everyon has fallbacks etc. but I just wish that something would go my way!