Hello there, and welcome to the Fanimestuck community!
The HS folks at this con are always really nice and really accommodating. You won't have trouble at all finding people who are friendly, and you'll probably make some new friends pretty quickly, no matter how shy you are.
Fanimecon is a somewhat larger con, and it can get pretty crowded. If I were you, I'd stay away from the very crowded areas if possible (dealer's room, AA, Stage Zero, etc.), walk through the lower level of the convention center or outside, and find places around where you can rest and take a breather on occasion. There are some lovely parks around, as well as various cafes and restaurants and a few large outdoor spaces that are actually part of the CC property (the front area, some balconies, etc.), so if oyu need to get away from the crowds, you can probably find a quiet corner you can rest in.
I have no idea what my schedule will be like at this con, so I can't volunteer to show you around, but if you ever see me, please feel free to say hello. I'm often in HS cosplay, though not always. (I'll be posting a cosplay schedule once it gets closer to the con and I get all my scheduling sorted out.) The HS gathering is usually on Sunday afternoon, so you will probably miss that, though it tends to be VERY crowded and probably not the best place for you. If you do happen to make it to the gathering, I'm usually the Condesce. I'll be a little grumpy, but I don't bite.
Though, if you are at the con on Saturday, that will probably end up being the day of Dinnerstuck again. Dinnerstuck is an event that I like to put on where a group of Homestuck fans all go out for dinner together. It requires making reservations with me in advance, and I'll have the info up around late April or early May, but it is a very fun and very chill event. If you do better in smaller groups than larger ones and want to hang out, you're more than welcome to come. Last year there were ~8 people in the group, though I can take up to 15 or 20, depending on the venue.