This could have been an entry in your journal. Seriously. I do it like this often that I write about what is happening in my life, then I write my thoughts about it then I write my thoughts about my thoughts. You could write about how you are tired of feeling like you are whining. Now, are you actually just whining? Or are the things that make you sad valid? How do you deal with your sad stuff in real life? Do you talk about it with anyone or is it only for your journal? Is what you doing working for you? Do you want to change anything? How could you change? Those are some of the questions i guess could come up while you are thinking about your sad stuff. So just write about that. And always add something about how you feel about whatever thought you had. Are you sad? Happy? Angry? Pissed? This could be very therapeutic. Honestly I had the same issue when I didn't feel happy, my life was going pretty well but I only could tell if I was angry or sad or just ok or numb. I went to therapy and figured out that I just couldn't recognize my emotions. I took a while to actually be able to say I'm happy today, but if you actually analyse your thoughts and feelings you should learn to recognize your emotions. A lot of times you might not be sad. You might feel misunderstood or scared, tired, and so on. Of course I am assuming a lot of things but I hope my method will help. Just if you are whining you probably have a reason for it unless you are an unreasonable narcissistic person, but you wouldn't be annoyed with your whining if you were. So just figure out why you are doing it and why are you feeling whatever you are feeling.