you were know as weak. People always underestimated you. You'd show them.

you went to the alpha of the strongest pack known, for help. You tried to convince the alpha to change you. The pack laughed at you.

everyone always laughed, you were sick of it. You grabbed the alpha by his shirt collar, pulling his mouth against your neck. The second your scent hit his nose his legs felt weak. He sunk his fangs into your neck, changing you.