First, the classical guitar is an
acoustic guitar. If the distinction is between metal (bronze - steel) string vs. nylon, why not learn both. The music and the techniques are different, and each will teach you different things about the instrument.
If you are going to start just one, pick the one that is suited for the music that interests you most. You'll be more motivated to stay with it when you get into playing what you want to hear.
The most important thing is to get a decent instrument. If you have a friend who plays the kind of guitar you choose, have him/her help you pick it out. An instrument has to have good action and tonality (playing in tune up and down the neck), or it won't give you the proper feedback and enjoyment, no matter how well you master the mechanical techniques.
Finally, regarding the issue of steel vs nylon, get over it. We all had to toughen our finger tips to play steel strings, but all the guitar players before you are proof that it happens.
Good luck.
