Turning down a job before having a chance to find out whether it suited you (by interview or doing it) prematurely limits your options. If the interviewer ascertains you've not got the experience, they may make you a lower offer with the option of increases based on performance.
That you're 10 months out of school may not fill you with confidence that you can go for a 50% salary raise, but I say, what do you have to lose? You might have to get up a bit earlier, smarten up a bit (e.g. wear a shirt+trousers if you weren't already) and learn to pick your battles wisely, but if you can do the job, why not go get it?
Another way of looking at this is that you've somehow determined that value = $50k + ('time since college' * ~$5k). That doesn't make sense - remuneration is relative to the value you bring to your employer.
Your StackOverflow account demonstrates you know a lot about a number of technologies and that the SO community (by voting) corroborates this.
So, by my reckoning, you're a smart guy.
It's totally understandable to be a bit less confident as you're relatively inexperienced, but consider that some people are a 'natural born genius' and others have to learn everything the hard way. Is it so bad that your natural abilities are well paid?
I have previously hired 'genius' guys at a reasonable entry salary, seen them become incredible engineers and have given them pay raises according to their output/value to the company rather than their age.