No one can truly help you with your graduation speech because they havent seen nor lived your life. But I can give you some themes that I found online while researching the topic.
- Greet your audience
- Introduce yourself
- Reflect on your time in school
- Highlight important moments or memories
- Talk about the future
- Keep it short
- Thank those who helped or inspired you
- Have a very important and meaningful conclusion
Over all I think your speech should come from the heart and be memorable.
Good Luck!