Before this day, you had never been called chosen. In fact, you had been told on more than one occasion that your aunt and uncle had not chosen for you to show up on their doorstep, and it's obvious they wish you hadn't. You're not used to all this attention, and everyone staring at you makes you feel very nervous.
Shaking hands isn't your specialty, mainly because you were never properly introduced to guests, but you end up doing a lot of this in Diagon Alley. Hagrid's kind throughout, and he even buys you an owl for your birthday. You try to show him you're grateful however you can. You're not very good at this; no one ever does anything for you.
When you see chocolate frogs that move, ceilings that tell the weather, and a hat that talks, you're happy beyond belief. You truly think that this can become normal for you. You like it much better than everything else you've seen, the life where you're not chosen, not good at shaking hands, and don't think everything that's going on around you is not only possible but real. You'd trade your old life for this one in a heartbeat.