Hello, and warmly welcome!
I'm a Finnish Lutheran and for us Nordic Lutherans, I think, Martin Luther and the German/continental European reformers are a bit more distant figures, whereas we are more likely to look up to our local reformers -- Agricola, Juusten, Petri: local Catholic bishops and priests who "went Lutheran" -- many of whom trained under Luther, Melanchthon, Bugenhagen before returning to their homelands having seen the light, so to speak, and feeling the need to clean up the local churches from "rotteness" that had crept in.
Catholic Mass back in the day used to be more like a performance, a show in which professional performers (the clergy) perfomed rituals in foreign language while the audience (the congregation) had to stand in the background and just watch. Ordinary members of the church were not invited to participate and were discouraged to explore the Bible and our faith on their own. Everything, the sacraments, their faith, their interaction with God, had to be filtered through the professional army of churchmen and/or the saints. Back then, you were disencouraged to talk directly to God by yourself: you "talked" to a priest and you "talked" via a saint.
Lutheranism changed that relationship from nonparticipatory "audience" and "subjects" to active participants and members of the universal church, above all by allowing Mass to be conducted in vernacular, in people's own language, as mentioned by
Paidiske, and the Bible and Bible-based theology (the Cathecism) to be mass printed and distributed in people's own languages so that people themselves could explore their faith and talk to God without the need of these "interpreters" (Catholic clergy and saints) in between. We can confess our sins anywhere anytime we feel the need. There's no rule we have to go to a church booth for that so and so many times a month or perform elaborate rituals in front of statues of saints just to tell God we have sinned.
I think that was and is the most fundamental thing. From my personal experience, confessing my faith together with fellow believers in my non-native English (or Swedish for that matter) is a performance for me -- I'm merely citing the words I know I'm supposed to cite, more or less -- done for the benefit of the native English-speakers around me so as to be courteous and not to stand out, whereas confessing my faith in my native Finnish is all about my personal faith, if that makes sense.