Also, try to find some time in your day to walk. Even if it is only walking around the block at first. Walk that block every day and then eventually you will find yourself walking further each time.
When I first started walking in April, my thighs would rub together and bleed. Also my shins and feet would ache like hell. It was very discouraging. But I kept at it. And eventually I got to the point where I am now walking 7-10 miles a day. I'd like to walk more but there just aren't enough hours in the day - even when you wake up at 5AM! To pass the time, I carry a MP3 player and I listen to lots of classical, opera, jazz, and other music I never give a chance to during the regular day. When you are walking, you can focus on the music you are listening too and really start to appreciate it. As well, I pay attention to all the scenery around me. All the fall colors are starting to come in around here.
Anyway, look at it as a journey well worth taking. Just take it one day at a time. You'll get there. And once people start noticing the weight coming off, you will be motivated to take off even more. At least that's how it was with me.