I can try to push myself but still frustrated with my stamina.

Many factors - nutrition, hydration, stress, rest (as in sleep), mental state, conditioning, how hard you're training, boxing ability (better technique = less energy spent) just to name a few.

 

What is your resting heart rate? Do you relax when boxing?

 

Train harder (fast, intense cardio intervals), and stay looser in the ring.
If you're new, it ain't gonna happen overnight.

 

My resting HR is freaking 70 and i've been working out a while man, what gives.

 

Unless something is going wrong or somebody is an outlier, most resting heart rate for a good amateur should be in at least the mid 50s.

 

Yes.

 

heavybag work man. a lot of peiple will tell you to run usually but this is boxing not a marathon. lots and lots of heavybag work is my recommendation. my routine consists of 3 6 minute rounds on the heavybag at least. but iv'e been at it 4 years


for a begginer master going three hard rounds on the heavybag. once you've got that down then move onto another round or longer rounds and just keep going up once you've masterd each goal

 

I understand your thrustration.

 

You'll get better as you go. I wok out all the time, cardio, weightlifting, I do power lifter and bodybuilder routines, bag work running etc. Nothing and I mean both works your body and conditioning like sparring. You just have to get used to it. Find a rythym and a steady work rate and pace and push yourself. There is no secret tricks when it comes to boxing. It's how much and how hard you work at it, and being lead in the right direction.