How can I get the willpower to lose weight that I once had ?

Well,
During the summer i lost over 30 pounds,

but then i started slacking and eating a lot again,
now i always say i’ll start TOMORROW, TOMORROW.

i was just wondering if any one had any tips to recovering willpower..

Thank you.
help i need to lose weight again
btw : i usually eat when my friends eat… and i hang out with friends quit e alot !