help? I am new here/advice?🤔💕

so I started my 2nd semester in college I recently broke up my long distance relationship with my ex and my last class of the day there's this girl I found out she's lesbian bc she blurted out this is why I'm gay during a class discussion and I chit chatted talked about our major but I haven't got confidence to tell her she's cutest 4'12 girl ever but I always have trouble asking for her number idk how to talk to her in a chill flow? Help???