Men keep hitting on me even with my engagement ring!
Is there a reason you think you are being hit on even though you are wearing the ring?
I think men are not the brightest people in the world.
That's fair, but I think the best thing for you to do would be to tell them that you're not interested and that you're engaged. It's best to make things clear for them, so there is no confusion.
I don't feel I should have to tell them, they cant even notice the obvious signs.
I understand, but in order to avoid this problem it might be best to just tell them right away. They should leave you alone after that.