I feel similarly, although for sure I am not the quietest one in my animation class (that title belongs to another girl who never speaks, and when she does, it is in the quietest whisper you will ever here. even her drawings are delicate and small!), as I have blossomed somewhat (ahah) to speak more freely, especially when in my element. It helps that I met one of the guys in that class before we even realized we were in the same class together -- he's a rowdy, loud class clown; therefore he is the connection to everyone. I associate with him, and quickly become accepted by the others.
Nonetheless, I do feel a bit different than everyone else. Besides cracking a few jokes here and there, none of my classmates know me on a personal level. It's because the class is small, we have to present storyboards bi monthly, and the professor constantly calls on people to participate....especially me, for some reason

....that I have been superficially accepted. They probably only have a sense of comfort around me because I constantly have to answer questions and present my storyboards -- although, for the latter, I am proud. I have been complimented a lot for my ideas, cinematography, and unique drawing style. In the end, I think my art speaks for me. Luckily, in a class full of animators, we share the same creative bone and an array of personalities. We seem to embrace our idiosyncrasies. Even the titled "quietest girl" in our class is loved by our classmates and the teacher.

It warms my heart. But enough of that cheese.
I think the best thing to do is speak through your designs. Share some ideas, and see if it starts a conversation with other classmates. In the end, graphic design can be very collaborative. As long as you have a piece of work or a few sketches to put down on the table, you have made your entrance as an artist, which should ideally be sufficient grounds to be accepted, and perhaps even create closer relationships with your classmates.