Super nervous 😣 ex best friend

I use to be really close to this girl my freshman year of high school.. But we really grew apart. We both did some not too great things to each other and stopped talking. But now four years later we are meeting for lunch tomorrow to see if we can still be friends. And I am beyond nervous :( I've missed her being around.. My boyfriend is being supportive as always :) but.. I just really want this to work out. But what if we've gotten so different and it doesn't work out? :/ we use to be basically the same person, but our lives went in two different directions. Any advice or anything positive would be really appreciated 🙁