Have you not seen the second GotG? That's not the only time he's denied being a raccoon just the one case I remember off the top of my head.
Oh, he's a raccoon, alright. If it walks like a duck, quacks like a duck, and blasts enemies to smithereens like a duck, he's a raccoon. ...Wow. I've been making less and less sense recently.
There are a couple things wrong here. Firstly, one of them is you assuming that I have not seen GotG. I have. Secondly, Rocket probably doesn't know that 'Trash Panda' is another way of saying Raccoon. Thirdly, 'Trash Panda' is used all the time to mention Raccoon furries in the Furry Fandom. So this is why I know this. Don't feel too bad. I've been in the same insane boat for years. Though I do hope everything is alright regardless on your end.
My comment was that Rocket doesn't think he's a Raccoon. He doesn't I don't know if that's changed after Endgame now that he's spent time on earth, but in the first two movies he's complained when called a Raccoon.
Likewise, my advice to anyone who finds him raiding your trash bins is to leave him alone. Just getting along day by day, trying not to let my circumstances bother me too much. Though arguably, these bouts of odd-mindedness are when I'm at my best on the fanfic-writing front. ()^_^ When I stopped to eat at a Cracker Barrel restaurant in Missouri on our way to Kansas in 2007, I saw a stereotypical motorcyclist---burly and muscular, dressed in leather, the works---with a Jigglypuff tattoo on his arm. Looking back, I think that was a signal that I'd yet to truly see the craziness the Internet was known for.