Hey, you can do whatever you like to your plants. They're your plants, after all.

Depending on your body's level of hydration, your urine can be more or less concentrated, or smell funny (if you've been munching asparagus), and have a LOT of salt in it; you'll never get the dosing consistent, your plants will fucking REEK (not in a good way), the salts will lock out other nutes, and you absolutely NEED the micronutrients provided by a real fertilizer to grow indoors.

But... do your thing... hey, why not read the thread about using menstrual blood as fertilizer? That one's a classic!