The fact that you built your own computer might qualify you for entry-level help desk work or PC support
I had never installed my own pc, but If you say to me:Install a new HD I can do it.

I had classes on how to make a new pc run, and the professor told me everyday:Are you sure you understand? I was very young ;) in those times, and I did learn how to.

is not about what you know now, it is about what you are willing to learn
After reading this, im more sure than never.Im going to study this.

Thank everyone for bothering to click in the REPLY button.And one more question:

What is IT?I never heard about that word!

Thank you

Caius