We may be adults, but we still carry wounds from the past. They can rear their ugly heads in strange and unexpected ways. Take the time to address these stubborn habits and patterns so they don't rule your life now and in the future.
Make a list of your old ideas (ways you think of yourself, like, "I am dumb"). Make another list of your grosser handicaps (labels, not specific behaviors, like critical and self-centered). Then make a list of your more specific harmful behaviors (like, you talk negatively about person A to person B) associated with the grosser handicaps.
Then go back and take the old ideas, grosser handicaps and the more specific harmful behaviors lists and write down the opposites of everything. (If the grosser handicap is being critical, the opposite could be practicing acceptance. If the specific behavior is that you feel cheap when out with people, the opposite could be throwing in an extra money when the bill comes so you feel generous.)
Essentially you are asking yourself, what opposite action can I take in each situation? What would willingness look like in each situation?