There are several ways to design your own T-shirt. Here are some tutorials that can help you get started:

- Canva offers a free online T-shirt design maker that allows you to choose from pre-made designs or create your own from scratch. You can add elements such as photos, logos, or illustrations and position them nicely into your apparel. Once you're done designing your shirt, you can order it directly from Canva.

- Adobe Photoshop is another tool that can be used to create custom T-shirt designs. In this tutorial by iBrand Studio, you can learn how to create your own custom T-shirt design with Adobe Photoshop by using font and graphic in The Smashing September Bundle from TheHungryJPEG.

- If you want to know how you can design and make T-shirts from your own home, this tutorial by Meg Ann Co. will go step by step from start to finish on how to design, cut and press a T-shirt using a Cricut & HTV.

- Envato Tuts+ offers a tutorial on how to make your own T-shirt design in 5 easy steps. From finding a T-shirt design to learning how to make your own T-shirt design, the entire process is as simple as it can get.

- 99designs has an ultimate guide on how to design a T-shirt in 8 steps. The guide covers everything from defining your budget at quantity to evaluating your design and getting the right files.

I hope these tutorials help you get started with designing your own T-shirt! Let me know if there's anything else I can help you with.