The analyses of a text #4

The narrator recalls his adolescence.
He is an apprentice of the proctor, Mr. Spenlow.
One day, he visited Mr. Spenlow's place, and he fell for his daughter Dara at first sight.
Afterwards, he acts like a lovesick one.

.........................................
And yet, wretched cripple as I made myself by this act of homage to Dora, I walked miles upon miles daily in the hope of seeing her. Not only was I soon as well known on the Norwood Road as the postmen on that beat, but I pervaded London likewise. I walked about the streets where the best shops for ladies were, I haunted the Bazaar like an unquiet spirit, I fagged through the Park again and again, long after I was quite knocked up. Sometimes, at long intervals and on rare occasions, I saw her. Perhaps I saw her glove waved in a carriage window; perhaps I met her, walked with her and Miss Murdstone a little way, and spoke to her. In the latter case I was always very miserable afterwards, to think that I had said nothing to the purpose; or that she had no idea of the extent of my devotion, or that she cared nothing about me.
[David Copperfield by Charles Dickens]
1. I'd like to know if "wretched cripple as I made myself" means "though I made myself wretched cripple."
2. I'd like to know if "I pervaded London" means "my fame pervaded London."
3. And I'd like to know what the to-infinitive phrase "to think" means here.
Thank you in advance for your help.