Talk to Psychiatry on Negative Thinking

AOA my question is related to negative thinking (except my family)'...... my thinking is more inclined towards negative ( not suicidal) rather than positive or moderate thinking. whenever i came across any matter the negative thought regarding the matter comes in my mind and mera mind usko justify krta ae means i feel ok with the justification but my question is related to thing called positive thinking plz deal my question in a way that it convinces me rather than 'woi typical batien' e.g if i think positive about someone and that decision of me comes out negative than how will i justify the situation? or how can practically i think positively or how can i be able to take decision of matter by looking at all positive and negative rather only to one end