To make the text look like handwriting, you need to download cursive hand lettering fonts you like and use them while working in Photoshop or any other app. If you want your text to mimic precisely your own handwriting, you need to digitize it. In this case, you have to write the letters you need on paper (or on the screen of your device with a stylus or just a finger), take a high-quality photo, or better scan it and then transform it into an actual typeface you can use for your work. You can do it either in Photoshop or in special programs that specialize in fonts making.