What can i do to make myself more positive?

Practice: Understand that you have a choice of what to focus on or emphasize. Just as you can switch tv channels, you can also change what you place your attention on. It can also help to be more scientific or fair with the use of your attention. Give equal time (or more if possible) to appreciating, being grateful, celebrating vs. Complaining, resisting, rejecting. This probably will help.