I really am myself, but can I prove it?

I had my first big I-left-my-home-I-don't-know-what-I'm-doing-maybe-I-can't-do-this meltdown today (and yes, that was many ideas strung together but it was a complicated meltdown that will probably happen again). The catalyst was that the US Postal Service appears to have lost the package that had my driver's license and I'm flying to Detroit for a wedding on Friday. I took the plane here without ID, and they let me on the flight, but they do grill a fair amount and give you a "special" search. As a side note, it feels weird to have no identification and not be able to prove that I am myself. Existentially, there is something strange about not being able to say "but I am me--can't you tell?" Anyways, this led to a larger panic about why I was here, and whether I was succeeding.
After a period of spinning and trying to sort it all out on my own, I reached out for help and went for a walk with one of the TAs. He gave me really good advice--which was to have fun with the material and not feel like I'm trying to prove anything to myself or compete with anyone. I needed that reminder. I had been being stubborn and wanting to find a masterful solution to a difficult problem, rather than asking for help, and managed to frustrate myself and waste hours in the process. He actually told me I doing really well, and, honestly I knew this part, that I was still ahead of schedule. I was just getting down that I was less ahead than some people, which is awfully silly.
With that advice, I decided to do one of the optional assignments rather than force myself to move on. I had fun and made this:

In it you can enter two numbers and click on a mathematical operation and the result will show up at the bottom immediately (without reloading). That took more work than you might think, but was very rewarding and helped me understand AJAX a lot better.
However, I don't see this being the last time I face this type of freak out. This is scary and it's lonely sometimes, and life would be easier if I was just at home. But there is a reason I am doing this, and I think it may be more than just needing a new career. I do love coding, and I also needed some perspective on my life, which I am getting. The most important thing I've learned is that over the last few years, I've really built a life I love back in DC. I hadn't seen that until I was far away.
I also learned something through riding a bike (not how to ride a bike though--I already knew that). The cheap craigslist bike I'd been riding lost a part, after I incorrectly removed the wheel. I asked my (amazing) host if I could borrow her bike and she recommended a comfort bike she had around. When I rode it the 8 miles to my program over the next week I had an epiphany: I was not nearly as bad at biking as I'd thought--I hadn't been riding good bikes! I had so much less trouble going over hills and the 8 miles felt easy and energizing rather than exhausting. Like studying coding, it was a better fit for me and that made all the difference. Sometimes I blame myself when something isn't working well, rather than thinking about what I can change. But maybe there's nothing so horrible wrong with me after all.