I (used to think I) love(d) someone.

Daaaaamn, check her out!
Yo, that ***** is VERY PRETTY!

I (know better than to) believe that nothing is impossible.

Maaaan, I would  HOLD THE DOOR OPEN FOR  that chick all night long, if y'know what I mean.

I (pretend to) listen to what other people have to say.

I hear ya, but me personly, what I'd like to do is  MEET HER PARENTS  while wearin' A NICE SUIT  and have a  PLEASANT EVENING WITH STIMULATING CONVERSATION.

I've (given up on all my) dreams and ambitions.

Maybe even bring  A BOTTLE OF VINTAGE WINE  so that I could really  MAKE A GOOD IMPRESSION, if you know what I'm sayin'.

I want to (believe there's no point in trying to) make the world a better place.

**** bro, you are one  RESPECTABLE AND STAND-UP  ********, you know that?