I started med school fairly sure I wanted to do something surgical. After anatomy, except for the block on arm and leg, killed me, I decided ortho was what I wanted to do.
The summer between 1st and 2nd year I worked with kids and loved it, and decided, screw ortho, I'm not smart enough anyway, I'm going into peds.
2nd year I loved pharm and did some shadowing and decided that peds was boring and I was going into anesthesia.
All through med school, also, I should mention that I kept a list with The Specialties I Absolutely Will Not Go Into. This included neuro, ophtho, general internal med, ob/gyn, family med, and many others I had decided were absolutely not for me.
So then I started off 3rd year with OB/Gyn. All my careful research on specialties and figuring out my own personality went out the window...and now, ironically, I'm going into something that started out on my Hell No list. So keep an open mind, and you, too, may fall in love with a specialty with an awful lifestyle. 🙂