job hopper

I had an interview for a part time tutoring job today, which I probably won't get because my classes are all during their programming time and I don't think the interviewers liked me. The questions were pretty standard and I thought my answers were good, but I just didn't get good vibes from them. And one question really bothered me and caused me to feel a little defensive, so that may have cost me some points.

The question was also a somewhat standard interview question. The interviewer, looking at my resume, noted that Ive had several different jobs in the past three years since I graduated. I know this is a concern for employers and a question that is sometimes asked. Maybe he just felt like he was supposed to ask this question. I don't know, but it felt like a challenge. Since graduating UMass in 2007 I have worked at several different places (not all of them noted on my resume, they don't need to know I worked at Target). That summer I worked at Girl Scout camp, which obviously ends in the summer. After that I returned reluctantly to the Y as a site coordinator this time. That job ended with the school year, and I chose not to return for another year because there was no room for advancement, and I couldn't work part time with no benefits forever. Unable to find a "real" job I took a job at Target, which was the most miserable three months of my life. Out of desperation and a desire to do something that mattered, I did a year of service with AmeriCorps, not that it is a YEAR OF SERVICE. It says year of service on my resume. Unable to find a "real" job after that year, I finally ended up doing relief office work, which let to my first "real" job in HR. Which I left to go to grad school so I could get a job doing something I really care about, which is teaching kids. SO, that's 5 jobs in three years. But 2 of them are expected to end after a period of time, one is clearly not a long term option, and another I worked at for three years prior and had advanced pretty much as far as I could. And can you blame me for leaving my full time job for an opportunity to study at the University of Pennsylvania? I feel like this makes sense and is perfectly reasonable. Dream jobs are hard to come by, and I'm not going to stay at a dead-end job I hate just so my resume looks better.

Sorry I'm ranting. Like I said, I don't know if he asked the question just because he felt like he was supposed to, or if he was really concerned about my apparent job hopping. But really, am I really going to work at the Y part time for $11 an hour for the rest of my life?