Getting Isolated on a new ship

I recently started a new voyage and did not know anyone on the ship before joining. The rest of the crew all know each other and get on well, but they do not include me and I feel isolated. They also make jokes about me to my face when we are working. I don't like being picked on like this. They are rude about my ability to work and target me if I do something wrong - even if it is an innocent mistake. Lots of them make mistakes but they never call each other out, it is only me. I feel lonely and there is no one I can talk to.