Honestly, Money. I already knew I enjoyed being around people and helping people, but there wasn't enough $$ in Psych or social science around here. I met my current boyfriend (5 years now) who was in nursing school
and I followed suit. He's now in a Health Administration program (wants out of nursing), and I am now an RN and Nursing Director. I NEVER thought I'd love nursing this much, and every day I'm thankful for the change. I'm also *very* glad I became an LPN first. The experience of the ranks is invaluable.
In Psych/ social sciences, for me (personal opinion) there is no real evidence of the "good" that you do. Also, it's a repetitive job. In nursing, the gratification is immediate and it's different every day. Your patient improves, smiles, thanks you, etc. Now, dont get me wrong- many patients yell, scream, and throw stuff at you. Yeah, even poop. But- in the end you know that you're there for a reason, and the end result at the end of every day is the same- I have helped, whether they know it or not.