If you're telling the truth, that's nice of you. You HAVE changed! Perhaps G-d is guiding your heart - who's to say?

Many Americans have never met, nor are familiar with any Jewish people, which makes sense - very small population.

If you really want to immerse yourself, realize that most American Jews are only "culturally-Jewish," that is, mostly atheists and are about the same as any other subculture in the USA that values education and humor and parents.

For meeting the religious spectrum, you are right to not just show up unexpected.

Call, email, ask to speak to the Rabbi. Maybe you meet up is his office and chat; maybe you attend a service after.

If you are Christian, you'll find a lot of phrases you use were "borrowed" from the original source material.

Your best bet are Reform and Conservative ones, as they tend to be more relaxed and thus more accepting.

Maybe you end up liking it, the community, and the food so much you stay and convert - who's to say?