ONE SIMPLE REASON YOU STILL FIND IT DIFFICULT TO QUIT THOSE BAD HABITS.

One simple reason you're still finding it difficult leave your BAD HABITS is because 
you're yet to embrace GOD'S GRACE.

The closer you are to God, the farer you are from those bad habits.

Stop struggling to quit those bad habit on your own in trying to live a righteous life and spend your energy on pleasing and getting closer to God in the place of fellowship and you will be amazed how you will look and the bad habits are gone never to return.
All it takes to be saved is to call on the name of the Lord Rom 10:13; Just go ahead and confess him now as Lord and be saved Rom 10:9-10.
Peace of God be with you.