I started competitive dancing in my late 40's and has NO dance training when I was a child.

There are ladies 70 ++ out on the competitive floor.

Samba is pretty advance and is not usually taught until you get some better at cha cha and rumba.

Quick Step has a prerequisite of Foxtrot since it's a faster bit of a variation of it.

My advice is - stay with it! It's loads of information and step patterns, technique at first. It WILL get easier when these things start to become muscle memory.