i have one weakness help(cardio)

Run and Swim

 

Judging from the responces you have made in other threads, I think you need to learn to relax and pace yourself.
You say you like to always punch as hard as you can.., you try do do everything as fast as you can.., of course you will burn out quickly. There is a time for the explosiveness, but that can't be all the time.
Boxing is mainly anaerobic, but you need an aerobic base as well. As mentioned previously runing, swimming, skipping rope... these are good ways to build aerobic capacity. Sticking with your boxing workouts will also help gain endurance. Just keep trying to go a bit further, a bit longer each time.
for the anaerobic endurance, do intervals, heavy bag work, sprints, sqaut thrusts...

 

Yep running is necessary, it would make you feel lighter and help you move better if you run often.

 

could be nerves
to build aerobic fitness you need long runs or swims , skipping works aswel or step ups
for anaerobic work at the same pace on the bag but do twice as many rounds make sure ur pushing yourself every time
and you need to b able to breath properly aswel

 

What is it with the crazy influx of people advocating swimming?

 

you can also try changing ur pace during heavy bag and shadowboxing. if ur explosive for the entire round youll definitely burn out. try changing ur pace by slowing and relaxing then throw fast heavy punches for a few seconds then go back to jabbing and moving around. its acctually like interval sprinting

 

You'll never catch me advocating swimming. I'm afraid of sharks.

 

Ever hear of pools?? atsch

 

are you bulky, muscle type?...what % of your training you concentrate on Cardio...aerobic, anaerobic training?

 

my shoulder hurts wat should I do

 

Rest for a few days