Help, tmi though.

My vagina has hurt so much for about 2 weeks. It itches, and burns. When I pee, it burns so bad I start to tear up. When I wipe the tissue is bloody. It stopped for like 2 days and felt normal again. Then all of a sudden, it got bad again. Honestly my routine hasn't changed except one thing, and you all will be really grossed out, but I used my brother in law's bar of soap. Could I have caught some std from that? Idk if he has any std lol but yeah. Please help. I don't want To go to a doctor and have them stare at my vagina when whatever it is could probably just go away. I'm very shy.