To delete your Telegram account, you'll need to head to the settings menu. It's not as scary as it sounds, I promise! Just tap on the three lines in the top left corner, and then click on Settings. From there, you can start the deletion process.
Once you're in the settings menu, you'll need to click on Privacy and Security. This is where things get real - you'll finally be able to break free from the Telegram chains! Look for the Delete Account option, and click on it to start the process.