Forget all the consumerist society you live in had told you...It's a fake.
Forget you think you need the latest car/dress/shoes,etc to be happy, you might be for half an hour or day, but that's all...
You sure have heard the quote: Less is more!, this is true! Take it as an experiment: give up slowly to buying more stuff, eating more food or whatever that consumes your free time.
Yes, I know, it's going to be hard in the first days, it's the same as giving up to chocolate... A habit develops in 21 days, so have a little patience.
You'll be surprised to discover how less you really need to be happy and this has nothing to do with the things you used to buy.
Focus on the activities that make you feel alive: a great concert, travelling, sports,etc.
Spend your time with your friends, they are the ones that had seen you at your worst and still like you. Show them you still care, you manage to include them in your busy life, go to movies,drink coffee, laugh, make memories.
Don't forget that people need to be cared for and loved. It is said that you can't save people, you can only love them. The "less is more" principle doesn't apply here.
As strong or independent you think you are, at the end of a hard day you might still need a hug from someone you love. Show them this,embrace the vulnerability and trust more.
Cry if you need , be mad, but try again tomorrow and the next day until it works.
Also don't be too hard on yourself , there is no perfection out there, focus on being better than yesterday.
So forget the commercials, all the useless products you "must have", those heels or that dress and think of what makes you happy. Is it the look on this face when he sees you, last weekend's run, a hug from a kid?