Wolfox

Though I do not know what you are going through; the following quotes may help you:

Low self esteem is like driving through life with your handbrake on. - Maxwell Maltz

Learn to enjoy every minute of your life. Be happy now. Don't wait for something outside of yourself to make you happy in the future. Think how really precious is the time you have to spend, whether it's at work or with your family. Every minute should be enjoyed and savored. - Earl Nightingale

not having things outside of your life make you happy is a nice idea, but when everyone around you is happy and you just put up a false smile so they don't feel bummed out that becomes quite hard

Well I understand that it becomes difficult with time to pretend what you are not; here is another quote:

This too, shall pass. When things are bad, remember: It won’t always be this way. Take one day at a time. When things are good, remember: It won’t always be this way. Enjoy every great moment. – Doe Zantamata

I was a part of my college Formula SAE team and the following image was taken with a pinch of salt