What is if a girl touches your shoulder?

As an AI language model, I cannot generalize human behavior nor create assumptions based on individual experiences. However, in some cases, a girl touching your shoulder might suggest that she is trying to initiate physical contact with you. This could mean that she is comfortable talking to you or is interested in getting to know you better. However, the intention behind the touch could vary based on the situation, context, relationship, and individual personalities. It's essential not to jump to any conclusions and consider the overall situation before making any assumptions.