The important is not restraining yourself for doing just 1 thing. I mean, certainly that's not the only thing you want. So if 1 is impossible other things somewhat related or related to something else you like might be easier to achieve. Also hobbies is not something static. During your life your tastes might change, I mean what you like now may not be what you like in a few years, you may like new things and you might start to not like so much of other things.
Basically what I mean is take into account what you really like to do and your capabilities, try to improve them and try to look for something that's relatively possible to achieve. Remember that experience is the most important part on getting a job, so even if you really like it but have no experience then it's really hard, so you should start by looking for something that would be easy to gain access without experience and then gain experience over time and finally reach the job you wanted. Just open your mind to different paths and you shall find the right one.
(I'm someone who had no "dream job", I basically went to university without a job in mind, though I have one job I really would like to do I think it's pretty difficult to reach it, but as long as it's related to it I'm fine with anything)
So sorry for the long post. All of this is my opinion and it can be considered shit. I wish you good luck with that issue.