Nope, native Polish - having tremendous ideas with 'th' in English. I guess it's fair given how everyone else has problems with pretty much anything in Polish
Seriously though, I have an utmost respect for anyone actually succeeding in learning Polish - if I didn't learn it automatically while being brought up, I'd totally be like "naaaaah, no way".
EDIT: oh and about education, I took English lessons in the past, but it was mostly about igniting my interest in it - video games and movies are key here