Given below are some examples of simple positive affirmations (thoughts) that you can make about oneself, others, real life situations and the future, which will help you in becoming a positive thinker.

The self: I do like myself; I accept my weaknesses; I understand myself; I have special skills and qualities; I value myself; I believe in myself; I am lovable.
Others: I accept others as they are; I look for the best in others; there is something good in everyone I meet; I appreciate others.
A real life situation: I am capable of handling the situation; I have all I need; I am fortunate; there is a bright side to everything; nothing lasts forever.
The future: I look forward to each day; every difficult situation is an opportunity/challenge in disguise; each day brings something new and beautiful, something to learn.

Source- BK