No matter what you're living in, be it a small apartment, your first house, your parent's basement or your dream house, it is worth it to personalize it and decorate according to your preferences. You don't have to until you have that "one-day house" to buy (or make!) things that can make you happy now. You can always take them with you when you move. No one wants to come home to a place that is cold, or that doesn't reflect them, or that is void of functional furniture.
I don't know about you, but making things "prettier" or "better" is just in my nature. I love style, but not necessarily trends. And the home is a great way to explore that creativity!