Every1 sucked at boxing at some point even the pros. It takes years to get to a good level but you'll be better at fighting than the average joes off the street within a few weeks

If you've gotten yourself in tremendous condition, know even the rudiments of boxing, work on both more defense and getting inside and punishing the body to no end. Find a book and read about Jake LaMotta, Harry Greb, Henry Armstrong and try like hell to emulate their style....................Work hard young man and cure the doubts.

if you have doubts about your ability you will be soundly beaten like a dog, but if you have any character you can fight past that doubt and be the bets you possibly can.

You'll get knocked on your asss.