My friends will out shine me at my birthday party?

Im inviting 13 girls and its Alice in wonderland theme and its proubbly the biggest party ive ever had weve been planning for months i made amazing party favors decorations my moms been practicing makeing a huge cake its at my house so its gonna be huge! My moms making my dress "The 3rd dress alice wore the flower one the mad hatter made" and shes also making my friends who is the white queen becuz she was saying she was coming as ALICE!!!!! which made me very angry so my mom and her mom are making her a diffrent costume! Well this friend and anthore friend are well attention hogs the one who my mom is making her dress will naturally try and take over make the party hers and revolve around her like at anthore one of my parties! The other friend is crazy and makes people laugh *BTW my birthday is the day b4 hers but my birthday on a thurday so my parties moved to saturday the day after hers so im afraid shes gonna make this about her to* But shes having a big party a few weeks later so anyway shes crazy and dose stupid stuff and always ends up the center of attention!!!!!!!!! So im over weight and i really want this day to be about me but i dont feel im selffish becuz my parties always end up being about other people have to invite these girls there my best friends but how can i keep the party being about me and not them???