Moses stuttered. When he spoke, it’s likely that people didn’t take him seriously. So, it’s understandable for him to doubt his ability to address the pharaoh. But God saw Moses fit to be the messenger and spokesperson of His people.
You see God doesn’t look at perfection because there are no perfect humans. He looks at our hearts. What Moses lacked in speech, he made up for in obedience to God and a heart to free the Israelites.
God chose Moses as His anointed mouthpiece and messenger, a man who stuttered. What more can He do with you?