It's In My Blood

I was raised by my grandfather, and we traveled around the country together until he died.
I was just 15 when I was sent to live with my aunt and uncle. They were nice enough. They shunned my grandfather and the life he lived, but they loved me and took good care of me.

I did well enough in school, and I could have gone to college and had a normal life, but I wanted more. I couldn't stand the thought of being confined to that small town, trapped in the confines of normality.

On my 18th birthday, when I told my aunt and uncle about my plans, they tried to dissuade me. But after they realized how determined I was to leave, they admitted that they knew this day would come. "It's in your blood," my aunt told me. She said my mother, her sister, had done the same thing when she was my age. With tears in her eyes, my aunt handed me a special gift, a box wrapped in an old cloth. She said it belonged to my mother once, and I had better take good care of it. But she made me promise not to open the package until I was outside the city.

So the day after my 18th birthday, I left the place I had called home for the last 3 years and started on my own adventure.

....
I was quite mature for my age. I had been through a lot in my short years with my grandfather. And I learned a lot too. About things like how to shoot a gun, how to track, how to hold my breath underwater for almost 3 minutes, and a lot more. I was more than equipped to take care of myself.
....

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This is just a vague idea, but I might be interested in expanding it.

Let me know if you'd like me to post more.