Hold up. Don't mistake the criticisms here for bashing your voice as a composer. If people hear a similarity between something else and your music, meh who cares. I definitely heard some unique sections, especially with transitions and the development section. Yeah, maybe I hear a lot of Mozart and Beethoven influences, but what better way to learn then to emulate other musicians. Hell, you even picked two of the greatest composers who ever lived to model your symphony from. Just because this particular piece rendered a lack of "OMG bro so sick yer a genius!!1!1" replies doesn't mean it's a failure. It would be a failure if you wrote this, were too afraid to post it, and received no constructive feedback from listeners who took the time to let you know a piece of their mind, no matter how detailed or blunt.
I hate to see that you posted in the shoutbox that your teachers told you your music was "bad". You're a student of music, it's evident from your wonderful display of marksmanship regarding clean score writing as well as your talent for KNOWING compositional techniques to develop your ideas (which anyone can create) rather than spew a bunch of looped chord progressions littered with obvious crtl+c markings throughout your peace. I've been teaching music lessons for a bit now, and anyone who has shown what you have with this glimpse of who you are as a composer would receive nothing but CONSTRUCTIVE criticism from me, no matter what I think of the unique/pastiche relationship of the music.
That said, Beethoven will I think always be my favorite composer of all time. I have so much respect for him as I piece together all the little intricacies in his piano sonatas as I begrudgingly plow my way through them as if I were a child fisting the keyboard. I'll never have the stamina and pure intellect he had as a machine of a composer and pianist. But even though I admire him so much, I encourage you to make your brain a sponge and soak in everything that happened after Bach, Beethoven, and Mozart. I could go on and on about composers I never listen to but took something from the times when I gave their music an open-minded chance. I won't bore you with that, but I bring that up because I took SO MUCH from Beethoven and Mozart (not so much Bach 😄), that I could use those ideas and phrases and foundations and general discipline in composing in the modern world I'm a part of. What can you do with what you learned from them and apply it to this day, August 1st, 2020? Once you address this, you'll find the comments of "sounds like Mozart" will fade away and people will wonder what you're doing...then you can tell them about Mozart!
P.S. please let me know about your endeavors with creating a graphic score. I'm working on something and about to finish, I would LOVE to hear how it's done!
All in all, sorry for the ramble. I think this piece is well deserved of a bit more attention, as anything for orchestra requires a ton of meticulous work. This is a fine display of your talents as a composer, I'm very eager to hear what you have for us next. It sounds like you've been going through a lot, I only hope your distress manifests into your greatest work yet.