I'm proud of myself for losing 30 pounds
Thats great! What made you want to lose weight?
I wanted to lose weight simply because I was fat.
It is great that you feel proud of yourself for losing weight.  30 pounds is a lot and it takes a lot of work to do so; good job.
Why thank you good sir; I love to see a good result that I work hard for.
Now that you've accomplished that goal maybe you should reward yourself? This will reinforce positive behavior and teach yourself that you're able to accomplish what you set your mind to.