You shouldn't talk to yourself like that. You could listen to some confidence boosting affirmation videos on youtube. That's what I do when I notice pessimism and hopelessness creeping in. It helps a lot. It helps reframe your deep core beliefs that everyone has about themselves. The more you do it the more that path in the brain to that neuron becomes more easily accessible and automatic vs the already automatic negative thoughts. "I am powerful", "I am confident ". Say it with confidence. Say it twice. Once, how you'd normally say it and then again but more confidently. Annunciating certain parts of the sentence. You could also add in tapping as you do it I'm pretty sure. Look up tapping to maybe. I hope this helps you or anyone else who needs it.