I am confused on when to use "bin ich" or "ich habe" instead of "ich hatte"?

I came across this sentence: "Zum Glück bin ich dem Rat von meinem Opi gefolgt"Why does it say "bin ich" instead of "ich hatte" or "ich habe"? or

I came across this sentence: "Zum Glück bin ich dem Rat von meinem Opi gefolgt"
Why does it say "bin ich" instead of "ich hatte" or "ich habe"?

or:I came across this sentence: \"Zum Gl\u00fcck bin ich dem Rat von meinem Opi gefolgt\"Why does it say \"bin ich\" instead of \"ich hatte\" or \"ich habe\"?

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