Hey there, Eternalmuzik. Welcome aboard! Michigan is a cool place, but I haven't been there in a while.
One of the best exercises for learning to write lyrics is actually to write poetry. About anything and everything. Any little event that hits you during the day, sit down and write something about it. Heck, it doesn't even have to rhym or look like poetry, but the more rythmic and even you can make it, the better.
For example:
"We walked along a busy road and talked about the future.
A future brighter than our past, by far, and laughed at our good fortune."
Just thinking about when a freind and I walked to dinner a few hours ago.
The idea is just to get used to using words in a creative way. Practice writing anything as much as you can and the words will eventually come more easily when you want to write lyrics. Better yet, they will come at odd times when you feel inspired.
Good luck! I was your age when I started playing guitar and writing songs- and I still have trouble writing things at times.
Enjoy all the good stuff that you can find here on the board.
Chris