Trouble finding advisor with same research interest
While it would be ideal to have an advisor who has some interest and experience in your area of research, it is not strictly necessary. The most important things you will learn from your advisor, such as how to write papers, how to write a thesis, how to approach research, and how to design experiments are not domain-specific.

One option is that you look for an advisor that will be supportive, that you trust, and that you "click" with. If later on you need help from someone who knows your specific field, your advisor can probably put you in touch with someone who can help. That person might even be at another university. 

It might also be possible for you to have two advisors; one in your university or programme that helps you with non-domain-specific stuff, and another in your field of expertise that might be at another university.

When you meet with potential advisors, ask them if they think it could be a problem that your field of interest is different from theirs. They may suggest one of the options I've mentioned above, or something else useful.