Hey clucini,
Sounds like you need help managing your Messages notifications. We'd be happy to help.
While you've already mentioned going to Settings > Notifications with no luck, it's not entirely clear how you have things set up currently and what specific change you're looking to accomplish.
Do you currently have Lock Screen, Notification, and Banner notifications for Messages enabled? Also, you can adjust previews for your Message notifications here as well if you scroll down a bit, as some people prefer to keep their message contents private in their notifications, but still want to know who sent them a message and when. You can also find the options to adjust banner notifications here as well. For more help, check out: Use notifications on your iPhone, iPad, and iPod touch
If the particular option you're looking for doesn't currently exist, you may need to provide feedback using the following link: Product Feedback
We hope this information helps out.
Take care!