Some advice I've had along this journey:
At the end of the day we gotta remember we're just a part of life. Our "self" attaches ourselves to things we observe.
That chair is now "your chair," feeling upset is "I'm feeling upset," etc. When in reality all is just a part of life. Meaning at the end of the day we're all just life interacting with itself. What's eye opening is you really have no control how you feel, think, nor act, all the decisions you think you made are not in your control. Just knowing this, it's helped me become apart of the flow of life and to know I'm taking things way too personally, whether good or bad.
The term you hear this referred to is "no self" usually.
Think about it, try to force yourself to think happy the whole day, chances are you'll think of something else at some point in time. We can't control our thoughts. Also you can try picking a random number form 1 to 100. You may think you have control over how you think, for instance you might pick 50 because that's in the middle. But what stopped you from picking 75 because it's 3/4 of 100, or 100 because that's the highest number, or 55 just out of nowhere? Why did you specifically pick 50 and not any of those other numbers? The thing is when you really look at it, you had no control choosing the "rationale" behind it.
If you ever want to take a leap, check out liberationunleashed.com, that shyt will blow your mind. Read the material on the website first, then sign up on the forum and see if someone can help guide you.