so I was adopted 5 months ago and I have some....OK alot of jealousy over her boyfriend Im 21 years old,but I never had a person to call mom until know and my moms boyfriend does not understand that she has a daughter now and I dont really like him,but tomorrow we are going to see his daughter(I havent met her yet)in a play and then staying the night at his house.my moms boyfriend does not see me as her daughter,but just as her dependant.I really dont want to go but I dont want to hurt my mom.I fake that I like him when shes around,but this is all to new to me.HELP.....What do I do?????