Grumbler, your proposed versions have two separate meanings: (1) "You're interesting to me" refers to someone that you can sit and listen to for hours, but doesn't effectively connote a romantic or sexual attraction; (2) "I'm interested in you" infers that there is a romantic attraction.

Irina, what do you mean by this. The English is incorrect, but if you tell us what it implies, we can tell you how to say it correctly.