Hey there man...

Glad to hear you're taking an interest in the sport and even more pleasingly you're showing some potential.

As regards your question about the quantity of training- well yes, you should be training more. The three sessions a week with your coach are like tutorials or boxing instruction. You've got to apply that yourself and master the fundamental techniques. Supplermentary to this you may need to improve your fitness levels, strength and endurance. It sounds like a lot, but its the constant desire to attain perfection that allows us to develop as fighters.

Wish you luck.