Context is king. Language is pretty verbose, most of the time you can understand the gist without understanding 100%. So at least you can make a start - that's the first step! It doesn't have to be perfect. Granted, the French can be gruff about it, but most cultures appreciate you trying to learn and will accommodate you a bit.

It could be the training material. I'm an auditory learner and the Michel Thomas courses work amazingly for me. I also ignore spelling until later, because I find conversations much more important and also pleasurable (so I'm more likely to stick with it). My English spelling was atrocious, I still rely on Chrome's spellchecker (actually, so do many of my English friends!).

Keep at it, everybody's different!

Well half of those you can eliminate because they're grammatically incorrect or make no sense. (Je une = nonsense, unless you mean J'ai une whatever, but still, very different)

The others all have different pronunciations.