Another person chiming in here to say that you CAN do this! Getting started really is the toughest part.
I think that you are right on target with your thinking that you cannot do everything at once. You can't completely change your lifestyle overnight & it is easier to take one thing at a time. In other words, you cannot say "starting Monday I am going to do 5 workouts and eat 100% clean." That being said, you can make little changes to your diet and goals that are attainable adn in no time, you will be where you want to be!
Start tomorrow by upping your water intake and not eating any fast food. Take a 30 minute walk outside. You can do that, right?
Monday start your week by promising that you will continue w/your water intake & no fast food goal and to that, you will add packing your breakfast, lunch and a snack (not sure if you work outside the home) and not eat anything other than what you've brought. Try to make healthy choices but don't stress out too much about it yet. For exercise, do three 30 minute workouts....Mon., Wed., and Friday. Cook a nice healthy dinner. Keep it that way for a couple of weeks and you will find that you fall right into it and it becomes less of an effort.
Other things to add when you are ready for more:
Tighten up those portion sizes.
Make better food choices.
No eating after a certain time.
No deserts OR only ___deserts per week OR only sugar free treats
4 workouts per week...then later 5.
Longer workouts.
Add an outdoor activity day with family or friends.
I lost a lot of weight at one point and I know what you are going through. Nothing really got me going, per say, b/c I really just jumped off the couch one day and worked out to a video. Then I decided that exercsie was torture so if I was going to do it, why screw it up by eating college food!? It all fell into place and the more I did it, the easier it became.
Like others have said, you need not be perfect every day. Lots of people here have a "treat day." If you do, just be sure to get right back on the wagon the next day
And most of all...come here to vent, get information, seek advice. Its a great place for food ideas, support, etc. and you will find that when you are bouncing ideas around here, you feel more connected to that goal of being a healthier you.
SO you aren't a loser in the sense that you were thinking but you can be a BIG (weight) loser if you impliment some of these changes adn other suggested by the other posters!!!!!!!!! (I know, I know...bad pun....)
Good Luck and Keep us posted,
Christine