I feel like you've gotten very bad advice so far in this thread. I think it's weird that the guys in here are suggesting that you're on the right track. You look like a guy who has never lifted in his life, but probably played sports growing up. Nothing like an early Frank Zane or Steve Reeves. Sorry, but that's what I'm seeing.
First off, I see no reason to give special attention to your calves at this point. They're not small relative to the rest of your body.
Which brings me to the more important point.... you don't have an appreciable amount of muscle at this point. You said you're swimming. Are you currently doing any weight training? I don't see how this thread made it to 13 posts without anyone actually talking about weight training, considering the fact that you said you are interested in bodybuilding.
If you are seriously interested in pursuing this, you need to start lifting weights regularly. 4-6 times per week. My best guess is that you need to be eating at least 150g of protein, 250g of carbs, and 100g of fat per day, every day. That's a minimum estimation on my part, you may need more, considering you seem to be a pretty active person.
I also suggest you focus on the lifts that give you the most bang for your buck. These include overhead pressing, bench pressing, dips, pull ups, rows, squats, and deadlift variations. Get good at all of these, and you will almost certainly develop a much better looking physique.