Hang in there, Andre. Virtually all of us had those problems at the start. And short fingers never grow. ;)

Start at the start...Guitar Fundamentals 1 in the Core Learning System gets you going and your reach WILL improve as you progress through the beginner lessons. Once you get into the lessons, take a look at this, http://www.justinguitar.com/en/TE-007-FingerStretch.php . It also will help with stretch (and flexibility/coordination). Don't be discouraged...listen to what Justin says about his short finger(s).

IMO, you should concentrate on the lessons first, then start up Justin's exercise if you feel the need.

Best of luck...stick with it!