The past does not matter anymore. The best of sinners are those that repent. Changing for the better and leaving what was wrong, and obligating to Allah's orders, were all hard initially. Who said it was easy anyway? Jannah does not come at a cheap price.
So nurture yourself with sincerity, patience and consistency, you'll manage through. Giving up can never put an end to anything. If you fall, get back up and try again. You're only at loss if you quit it all. Slow and steady wins the race afterall.
