There's no disadvantage God has put in your life to use you. People say all sorts of things. For instance, 'God gave me cancer so I can reach cancer victims' or 'God made me blind so he can use me.' Very terrible assertions. If God uses you when blind, He'd use you better if you were sighted. Many christians don't even know it is God's will we are well and healthy. Some say God is testing them with infirmities so as to take them to the next level (some times it's self inflicted problems), but the bible says God does not tempt with evil neither can he be tempted (James 1:13).

God's role in temptation is to provide a way of escape (1 Cor 10:13). God does not need to break your leg, pluck out your eyes or teeth, or damage your kidney to teach you any lesson. Any lesson you need to learn as a believer is in his word...II Tim 3:16.