Why is it so hard to START exercising?

Ok, so I have lost 16 kilos with no exercise.
I have a gym membership, and why oh why do I find it hard to actually get there?
I need to do a list to figure out why I am not going!

WHY I SHOULD GO:

1. To keep going with the weight loss
2. To tone up. (Don't want to be a saggy baggy elephant)
3. So I can spend some quality time with my sister (she goes and keeps asking and asking and asking me to go with her - making me feel guilty about not going)
4. To feel better about myself.
5. The gym is only 5 mins away.
6. I love doing Combat and Pump, and Spin (sometimes)

These are great reasons and I am sure the you dear readers can give me many more reasons (PLEASE do so !)

REASONS WHY I DON'T GO

1. I am lazy
2. I am actually scared of going.
3. I don't like being the biggest girl there.
4. I don't like people looking at me and wondering what the hell I am doing there. Shouldn't I be at Macca's?
5. I want to go but talk myself out of it.
6. I get home, sit down and that's it. I can't be bothered to go anywhere again.(see point 5 in they why I should go and then point 1 as to why I don't!)
7. I always have good intentions. Always. Alas I am see point 1 and point 3.
8. I am super lazy
9. Maybe just maybe, I think because I have lost 16 kilos without exercise the last 25 or so will also just fall off.
10. I know that point 9 is a LIE  that I tell to myself.

So I am stuck. I WANT to go, but I avoid it. I am scared. I get tired easily (although not as much as I used to)
Every time I don't go, I can feel the disappointment in my sister (and Mum). I have let them down. I let them down getting so big and needing my lap band, so this is just another on the list.

I feel bad about letting people whom I love (and they love me) down. I feel really horrible and sad at just typing that.

I don't know what to do? I need suggestions and fast.

5.3mls

5.3 mls in my band. Going great. But I am finding my band tightens at night time making it hard to have a decent size dinner. Does anyone else have this problem? I still  don't eat breakfast as I am not hungry at 6:15am! I know I should but don't!

I have to stop weighing myself every morning. It's doing my head in. Sometimes I weight 82.9 other times it's 84.3.. arrghh! I think I need to hide the scales. Or give them to my sister and then pop oever once a week to weigh myself.