I went to the mall to pick up my new glasses
Did you like going to the mall?
I wanted to go out and hang out with my friends and I needed the glasses to see.
It's great that you could run a necessary errand and see your friends there at the same time. It's smart to get new glasses whenever your prescription changes.
I think this mall is a waste of my time and I don't see why I would go back there.
I beg your pardon, I thought you meant that you saw your friends at the mall, but it sounds like you needed to go there before you could meet with them.  In this case, I can understand your frustration at having to go to a crowded mall and walk around for a single purchase, however, new glasses are important.  It is good to prioritize necessary errands, and then we can have fun with our friends.