18 year old with 15 year old?HELP ME?

im 17 years old going out with a 14 year old in florida. i turn 18 in 2 months and my gf turns 15 a month later than i..i really like her but not sure of the legalities once i turn 18..im totally not into it for the i really dont care about that..but shes a totally awesome girl and just not sure what to do...please help