noooot at all man. I started same age as you, just played sports and did well in school never really cared about music or learned anything. Im 22 now, and my playing improved to the point where its easy to be in band or jam with people if I want, and my pre-med path keeps me from practicing nearly as much as I should.
I started using tabs, I think its a great way to learn to play...just try and learn some songs you like. Some people may disagree, but for me it was fun and the type of music I like (Dream Theater, Satriani, lots of "technical" progressive music) sure gave me a workout on technique (correct finger positioning, tapping, legato, etc.)
Go out and buy that guitar...please trust me from experience, the difference between day 1 and 2 months is unbelivable if you put some decent time and effort in.