Don't be concerned. Your novel IS a disaster (probably). And that's fine. I think your concern is a good indicator. It's preferable to look at it objectively rather than being one of those inexperienced writers who are entirely unaware of their mistakes.
Find a writing group (in person or online) and share excerpts with them. Writing groups can sometimes go into a state of "no, it's fantastic!" groupthink, but it can be pretty beneficial if you find a good one. If you have any money burning a hole in your pocket, look for an editor who can offer you a fair evaluation and some advice. Best essay writing service cheap.