All Our Wrong Todays by Elan Mastai

What would you do to save the person you love? Travel back in time to an alternative universe maybe?
Tom Barren is an average guy who is overshadowed by his famous physicist father who just happened to invent a time machine. His mom has just died and she really was the only person who cared about Tom until he met and messed up Penelope's chances for time travel. He goes back to an alternative universe where he is a big deal (and named John) meets the sister he didn't have and finds another really lovable Peggy (Penelope). Even though this reality is more difficult to live in ( you have to choose what to wear and eat) he really likes it much better and has a few problems to correct from what he did earlier which gets messy. The first person pace is fast and witty but don't be surprised if you get a bit mixed up along the way with all the time travel possibilities. It is an interesting way to look at life choices - if you could go back and change things, would you?