Have you even wondered what to make out of your life when in the mid-20s ? It is like you do not interpret life as others see it. You are searching for the answer as to who you really are, what to do with your life. Anyone experienced this hollowness ?
I've experienced the confusion & stress of it, but I tried to turn my energies into something positive. Now, I try to look at life as an adventure and go after the things I want in life. It truly has made a difference in my life. But yes, I have felt the way you describe and discovered it is called a "quarterlife crisis." Even though it can be a stressful time, it can also be the best years of your life too, as you search for who you are and what you want out of life. There's so much to explore!