While it would be beneficial to look for a position that would be relevant to the field you might be interested in pursuing, this isn’t a necessity. Exploring a new field and finding out that you aren’t in fact a fan can be just as useful in your future job search as finding something by which you are intrigued. A realization that you don't want to further pursue a type of work means narrowing your search and learning more about yourself.
Whatever opportunity you end up landing, you can pick up skills from it. Say you wind up as a receptionist at a local office. You’ll be walking away from that summer position with better communication and people skills while also becoming familiar with operating in an office setting. Maybe you want to be a camp counselor instead. Well, you’ll be sure to gain experience in a leadership position and develop problem-solving skills as well. All of these abilities make you look more employable to a company the next time you’re on the job hunt.
Now that you know that you can learn something useful almost anywhere you’re hired, I’m sure your next question is how to go about getting a job. The job search can definitely be a stressful process, but it is doable! See if your parents or teachers have any connections in the community that could lead to you getting an interview. Networking will get you far, and it isn’t cheating -- it’s using your resources wisely. However, if that doesn’t pan out, don't fret. Check out these useful websites to kick off your search:
Apply to a healthy amount of positions (dedicating time and effort to each and every application), prep for your interview by researching the position and company thoroughly, and act professionally. Come fall, you’ll be far ahead of the game since you’ll have used your summer wisely by getting work experience. Good luck with your search, and get ready for a great summer!