Uncomfortable changing in my room

When I'm with my dad I share a room with my step sister and I have for years. Also for years I've been uncomfortable changing I'm our room bc I always thought my step sister was staring which she was. I started to think she was lesbian( I have nothing against lesbians but I wouldn't feel comfortable changing in front of a step brother either.) And I found out s few months ago she is bisexual. It is just so awkward and uncomfortable for me to get dressed in my own room and with 7 people living here and only 1 bathroom changing in the bathroom isn't easy. I always try to turn my back to her but I can still feel her staring I don't know what to do