You are in the Harry Potter universe, what do you do?

Let's say a bored deity decides to transport you into the Harry Potter universe, you are a muggleborn, you are 11 years and just got your Hogwarts letter; you in Fred and George Weasley years, you keep all your memories of your life here, you keep the same gender to not be too destadestabilized. You are an orphan living in a muggle orphanage.

You are an average wizard, you can get better by training, but you can't become Dumbledore in a few years, or even ever, he is one of a kind.

How do you handle this? Which house do you choose? Do you train for the next war with Voldemort or just flee the country?