Hello, Catholic here curious about Lutheranism.

I went to a Lutheran Church a few months ago and I admires the familiarity to the Catholic Church. However, I'm sort of hesitant about joining. And please bear with me as I am genuinely curious and not a troll.

Martin Luther was one person who decided to break away from the Catholic Church and sort of start his own thing.

So I guess my question is, would someone be able to explain to me the validity of Lutheranism considering that it started from what one guy thought was right?