it does sound like its a little watered down but i cant understand why, to be honest if its your first kit and it comes out tasty and alcoholic be happy :).
I left mine for 3 weeks before bottling to really let it settle and mature. with higher gravity beers it takes longer to reach maturity. After bottling i left them in the warm for 2 weeks then tried one to check for carbonation. it was very fizzy so i left them outside somewhere constantly cool for another 2 weeks to mature again. i started drinking them and every week they got better until about week 8 from bottling when they peaked, i still had over half left at this point but you could just leave them 6 weeks from bottling and start there. depends how thirsty you get
The hardest part about brewing is patience. ive done 3 kits but learnt so much by browsing the forum. unfortunatly im in the middle of moving house so wont be able to start another yet.