I think you are on the right track by recording yourself, you just need to practice some more. Have fun with it and take control of your voice, instead of speaking too fast. After some time you’ll get used to speaking more slowly, and with power, and then I believe you will see good results. Maybe you have a stutter, hard to say from here, but you’ll need to slow down eventually either now or later in life, so people can understand you, with a stutter or without.