Don't let introversion be an excuse or disability. You can change and adapt. Not to say you'll turn 180 into an extrovert, but you can definitely become less introverted. And don't expect too much at the beginning. It takes a lot to build the kind of trust and care that you demand from others and they're not going to easily give it to you so soon. One or two outings is too early to judge just enjoy their company at first and then see where the relationship goes when it starts to develop further.