I played a little WC3 before picking up SC2. Night Elf was my race of choice after watching Moon play, that guy inspired me to stick with Night Elf throughout my entire WC3 playing days.

It was only natural that I started playing Terran in SC2, as they were the only available race to play in campaign (until later on, toward the end) as well as their similarities to Night Elf. Ranged units, tech trees, mobility and harassment, etc.

However, I hit a wall at Platinum where I could no longer progress further in the ladder. I switched to Protoss after having dabbled with them in campaign.

I caught on quickly and started using them exclusively. After 4gating my way through custom games to learn the tech tree and timings, I started learning other buidls to work on unit compositions and what not.

After switching to Toss I finally broke through into Diamond. Hopefully I'll get to Masters soon.