There is no draft for spiritual warfare. Yo don't get saved and then wait for a notice of draft from God. He doesn't selectively draft people who can be deemed capable for battle. There are no people labeled as "4-F" in God's army.
You were inducted the very moment you entered into salvation via relationship with Jesus Christ. (The key being the word "relationship")
The devil declared war against you before you were even born and takes special notice of you the day you become born again. So there is no draft.
The good news is that God immediately makes available to you the equipment you need as weapons of warfare in the battles you will face. He has already won it for you. So you just need to follow Him through. You also have angels watching over you. So if you are feeling the "burn," --then rejoice. The devil doesn't want to hurt you..he wants to kill you. If you weren't important to God and God's army..the devil would leave you alone.