If I go back and can remember what I knew I was going back for, I'd totally go to the past, like way young. Then I'd ce out much earlier and transition before puberty. If I can't retain any memories then I would go a year into the future maybe.
I'd go to the future to see if life became worth it. If there are time machines available and life is still shitty I'd go back time to prevent my birth from happening.
I would go to the future. I don't like dwelling on the past. I'm looking for a place to live right now so I'd like to go to the future to see how that works out for me.