The number one thing that truly changed how I see myself and the world was the practice of yoga. Any unhappiness I had or still have is because I let my mind wander - most of the time we are the reason why we’re suffering. It’s all an internal battle, not necessarily the external factors. When I practice yoga I am truly able to let my mind go, and that is something I struggled endlessly with. I still do struggle, it takes patience and practice and you must consciously be aware! There are so many books and inspiring people that can help you, but a really strong suggestion I have is to surround yourself with people who bring nothing but positive energy into your life. Good energy feeds off of good energy!
The Secret by Rhonda Byrne is great.
Also if you have Instagram I highly suggest following Rachel Brathen, my most favorite yoga guru. She has inspired me in so many ways.
Don’t be ashamed to be selfish and work on YOU.