It's been a very long time since I've listened to your music, and it is still just as beautiful now as it was when you first made it. You are very, very talented. You should work on more things! I'd love to see the similarities and differences in your musical interests from back then, to now.
Not classical at all
I'd put under ambient or more likely new wave. It's certainly mellowed out and pretty good in composition, but it's not quite my taste. Who knows; maybe it'll grow on me.
But definitely not a classical song. Also, FL Studio default drums don't particularly fit this piece that well (at least not the hats).
Please contact me if you would like to use this in a project. We can discuss the details.