Re: How bad are these fiberglass scratches?
They look cosmetic to me, nothing more. You can fix them, as described in other replies. Then, as a new boater, you'll get to add new ones. Nothing you took pictures of would put me off the boat at all.
If you want a scratch-free boat, buy a new one, then the only scratches on it will be the ones you put on it. Think of this boat as pre-scratched.