Toxic, harassing lab environment
First of all, not all research labs are like that. You can find better work environment elsewhere, perhaps even have luck in the same University.

The academic world, however, is extremely small, and people will talk behind your back. You can't fight that. One way to minimize this is to minimize amount of time you spend in the current group.

Hence, one of few options is update your resume and start looking for another job. Your current situation will not become better. One of the reasons is that you have no political capital (friends) to change it, and filing complaint will definitely make your life worse in the group forever.

While searching for new job, try to connect with local chapter of Women in Science or similar unofficial group. Major universities have those these days. Ask them for help and advice. Another contact is something like Office of Equity and Diversity. These people have seen your situation before and will give guidance.

When you get a new job offer, you might want to consider filing complaint with HR specifically naming your current group leader. Hopefully, university will pay attention and investigate.