I've always heard the line as "steeled by years of my indecision," which I think makes more sense in context.
As in:
"tr.v. steeled, steel·ing, steels
To cover, plate, edge, or point with steel.
2. To make hard, strong, or obdurate; strengthen: He steeled himself for disappointment."http://www.thefreedictionary.com/steel
I've always heard the line as "steeled by years of my indecision," which I think makes more sense in context.
As in:
"tr.v. steeled, steel·ing, steels