You are in no-man's land at 50,000 words. Too long for a novella, too short for a novel.
Actually, that's not true. I'm not very knowledgeable about Young Adult fiction. I always thought a novel needed to be at least 80,000 words, but I have a friend who has published two literary novels well under 60,000.
80,000 words will give you about 300 pages in standard paperback. That's what publishers of fantasy and science fiction aim for, unless you're a Very Famous Author, because that is the expected minimum length. Readers look for a book that feels about the right thickness, and 80-90,000 words gives that to them. Anything shorter and they might feel cheated.
Yes, it's like selling bags of peaches.
My latest novel is just shy of 75,000 words. For a time, I feared I wouldn't make it to 60,000 words, which would have been bad. But then I wrote in this 12,000 word sequence that not only got my word count up, it opened up a character I hadn't fully explored and really brought him to life. So it made the story considerably better. I think that if the novel is ever published, that part of the novel will be the part they remember most. It is certainly the part that will get the book banned all through the south.
SOoooo, if you are worried about your word count, I would advise that you give your story more thought. I don't recommend padding, but there could be parts of it that could be explored in greater depth. But first I would do more research about expected word lengths for your chosen genre.