is it annoying because it's a wiser and more mature attitude? is being negative the only way to socialize and be "relatable" with others?<<< I guess so, but there are many people who will find you inspiring
If you have a positive attitude and see the good things in life, you will live in the abundance and not in the insufficiency. You will have a healthy heart, and that is one of the most important things in life.
Tomorrow might be Monday but be a shark! Instead of complaining - make a plan to kick this weeks ass be a boss have a positive attitude stay determined having forward focus on your goals - ATTACK the week!