Answer: Play it cool
Explanation: Honestly, if I was you I would just kind of let people come to me. If its anything like my school, people will flock to the new kid, and invite him/her to there group. Try to get in with the so called popular kids, being in that group is generally the best time. If people dont end up coming to you, you could try to ask a group you prefer to sit at there lunch table, or eat lunch with them. Might be hard for a introvert, but give it your all, you got this.