Nihilism is the logical result of extreme over-rationalization and critical thought -- don't feel bad, you just mastered materialistic thinking in it's entirety.
I guess, I could help you:
1) Do you believe in a higher-self, god (either in a pantheistic or theistic sense), or intelligent design? Karma, reincarnation, resurrection/last days?
2) Do you view people who believe in magic as childish, and people who are overly religious assume too much? Must every concept be defined in causal frames of reference?
3) Do you see the progression of aeons of development and their cyclical nature? Are beliefs like suits that you can wear to obtain ends which you are free to create or destroy as needed? Do you naturally favor quantum explanations of the universe and spooky action?
These questions basically help determine the self identification you currently align with: 1) Transcendental or Religious Thinking, 2) Materialistic, 3) Magical
No one is completely in any one of these camps, but they can be used to figure out what philosophies would provide interesting content for you. If you find yourself 50/50 on something it's ok... Sort of my brief breakdown of compatibility based on number.
1) Popular religions in general. All Abrahamic faiths, hindu religion, etc...
2) Hardcore skeptic/atheism go for readings on the four horsemen, but don't be afraid to go old with Aristotle or John Stuart/David Kelly/misc others... In general the older authors have the same reasoning without the anti-theism.
3) Buddhism, Pagan Religions (They often encompass some elements of #1), Magical Schools (Thelema, Chaos, general Hermeticism), Left-Hand Path, etc.
I'm not really trying to apply to all cases, but rather just give you some ideas where you would like to read. If the problem is really that you can't figure out who you are... Let's start here:
The Black Iron Prison (pay specific attention to the Jailbreaking section...)
Enjoy!