Tips to come out to my mom?

Isabelle • Heyy☺️names Bella I'm 13 6/24/2003 ayeee lol,but I just joined to help me track my period and learn some new thinks about my period🙃
Hi,I'm Isabelle and I'm 13 I'm lesbian and I've talked to mom about to but she alwasys tells me that I'm too young to know and that this is just an stage in my life ( Mind you I've liked and dated girls For 6 years now)...Ik what I like woman!! But anyway dose anyone have any tips to come out to my mom so that she gets it gets it?  It would be a big help!😭😭I really need this