so, i just started going to the gym today. im 16and pretty lanky and scrawny so..yeah. anyways, i went in today, did about 15-20 minutes of cardio and then i kind of just felt..lost. i walked around the weight training area just staring at people in awe and confusion. i tried doing i think bicep curls (i really dont even know) and all i could do was 15lbs (2 sets of 10 i think) and lat pull on 40lbs (3 sets of 10) because thats pretty much all i really knew how to do. i sat down and then got up 5 seconds later at about 5 machines. i just felt like such a newbie and so weak and i didnt know what the hell i was doing..any help?