I would be happy. I could restart my life but have my current education (Masters with a 3.8 GPA in my undergrad and 3.9 in Masters) and USAF experience ...while also using the privileges afforded women. I also just got an extra 20-30 years of lifespan out of this!
First I would immediately transfer all my money into cash, then into a foreign account to secure it along with some investments. I would sell all my shit over ebay to boost this amount. Then I would "go missing." As the real, original me is now gone and seemingly sold all his shit and fled the country, I am free to do my next step.
Assuming I am 8-12, I would immediately call the police and claim that I lost my memory and I don't know who or where I am. They would spend time doing medical tests, try to find my parents, etc. Eventually I would be foster-homed and/or adopted out. Doesn't matter how. During this time I adjust to the idea of playing 'young' around people. Not let them know how smart I am.
I would be put into school and excel beyond my peers. Seemingly a genius who 'quickly' learns all her topics. This would afford my scholarships to go into a better university than the one I went to as my old self, and hopefully at a much younger age!
With reinforced education I could master a new topic in the university and seemingly learn things (my old knowledge) on the side for fun. I would essentially graduate with a new field of work + having mastered my old field of work. Using this immense mastery of the sciences, I would go into the USAF and shoot for pilot as young as possible. I failed the first time around but this time I basically have 2x the experience.
Now, in my early to mid 20s, I would be a USAF pilot with a strong science background. I would immediately begin pushing for NASA. End up an Astronaught if luck is on my side, or land a nice job anywhere else. If all goes well I would be one of the youngest female astronauts by my 30s. >Continued