Grammar mistakes and/or a more vivid way?

Hungry wrote:

Could someone please have a look at the following text and let me know if there are any grammar mistakes and/or if there is a more vivid way to say this? Yes, I’m very finicky. Not that I am a teacher now. You are or you ar not? "Not that I am a teacher now" = You shouldn't think I'm a teacher now. It’s since my childhood. It's [what] since your childhood? It's been your dream? Your ambition? Your calling? But it’s true that as a teacher I am more finicky and devoted. Devoted to what. More finicky than what? My family is always telling me not to be so devoted, because these days most students don’t really realize that. Don't realize what? That you are devoted? Just how devoted your are? But I reply, “Their success in mine, too. And I am ready to dedicate my whole life to achieve it.” Teaching is not a piece of cake. It’s an uphill struggle. But, as you said, it’s [a source of?] great pleasure and self-satisfaction for an honest and devoted teacher.

Finicky is not a very common word, really. It means picky. Do you mean that? What are you picky about? You use "finicky" and "devoted" so many times. Who is it that said that it's a great pleasure? The person who will read this? (That's what the "you" says.)

Hungry wrote:

Could someone please have a look at the following text and let me know if there are any grammar mistakes and/or if there is a more vivid way to say this? Yes, I’m very finicky. Not that I am a teacher now. It’s since my childhood. But it’s true that as a teacher I am more finicky and devoted. My family is always telling me not to be so devoted, because these days most students don’t really realize that. But I reply “Their success in mine, too. And I am ready to dedicate my whole life to achieve it.” Teaching is not a piece of cake. It’s an uphill struggle. But, as you said, it’s great pleasure and self-satisfaction for an honest and devoted teacher.

Yes, I'm very finicky, but it hasn't simply started since I became a teacher. I've been finicky since I was a child, although it's true that as a teacher I am even more so now than when I was younger. I'm also very devoted to my students. My family is always telling me not to be so devoted, because these days, most students don't even realize how much effort their teachers put into their classes. But I reply that their success if mine, too, and I am ready to dedicate my whole life to achieving it. Teaching is not a piece of cake -- it's an uphill struggle. But, as you said, it's a great pleasure and a source of great satisfaction for an honest and devoted teacher.

Now, please do not be offended by what I'm about to write. Please do NOT ask me to come back to this again and again with minor edit each time. If you want to change something, change it. This is YOUR piece now, so do with it as YOU want.