It seems for me, that you know how to build yourself up. This is a nice bankroll, don't know tho how much time took for you to make it, but from zero definitely a great achievement, that you can be proud of.
The fact that it cost you nothing even makes an impact, that this hobby is actually is nothing to be afraid to being passionate about.
I think you can be at the level where you are playing a pro without noticing that you are actually a pro. This is just even a word, you know. But if you are capable the be a winner player at the levels that you chose, doesn't mean that you are some kind of pro at that levels?
One more exciting thing is that you made me think when you said the fun stop, stop. You are absolutely right, being desperate in poker is just like you cannot breathe properly, will not be great to the health. I was sometimes placed myself in situations, where I didn't find fun it, but not in a permanent way, just like when you eat too much from a cake, you can be discusted a little about it. Maybe there are limits, we have to follow.
Really like your attitude, and good luck in the poker field.