I visited London and was disgusted
What was disgusting about London?
As soon as I arrived I was directed to a guide and had to walk with him for 4 hours to see all the attractions around. He even wanted to take me back to my hotel at night. That's ridiculous.
I'm sorry you had such a bad experience, so I hope you can learn from that all and not visit such bad places again. You deserve to have a nice vacation, so you should research more or else you might suffer again.
London is a horrible place and I just wanted my vacation to end.
Now you know that you don't like London! Next time you go on vacation you can do some research beforehand to see if other people have had a good experience at the places you're considering.