How do i tell her we r moving 2 fast?

Last night i was at the movies w/ my gf n sum friends. My gf n me started makin out i mean no big deal. When i was walkin herr home tho she asked if i wanted 2 come i n cuz her parnts wernt home i said no but she looked really hurt. plz plz help i luv her but im only 13.