point out my mistakes guys so i can learn

so i met this hb8/9 last week talked for 2 mins. i later added her on fb and i used some off the fb opner on this forum along with lots of negging and genrallygot atteraction. anyway she offered to meet me for coffee with her friend and even gaveme hernumber without asking.
once i met her in real life i froze up. i mean im normally a quiet guy and the second i opened my mouth i forgot all my routines and calibration and turned into a AFC. i made the whole meeting awkward ( they even kept saying ur so awkward to talk too).
anyways at the end the hb asks me "why should we be friends" and basically asked me to qualify myself. she asked "if our convos are gonna be this awkward and quiet how are we gonna be friends". i literally froze up coz i didnt know what to say and i just said "u cant ask me why we should be friends that makes itmore awkard". i think that was a shit test and i think i failed coz i ended up stuttering while answering her questions. she then said to her friend that they should leave. i then kinda explained to her that maybe meeting one-on-one would make me be better but she kinda decided that i wasnt the same attitude that i had on the fb convos.

how should i reopen her on fb and rearrange a meetup day to fix this.