Even if you don't have best friends, if you have friends you get along with, things will be fine.
You'll be fine as long as you have some friends. They don't necessarily have to always be with you.
ご質問ありがとうございます。
① "Even if you don't have best friends,"＝「親友がいなくても」
"if you have friends you get along with,"＝「気が合う友達がいれば」
"things will be fine."＝「物事は上手く行く。」
② "You'll be fine as long as you have some friends."＝「数人の友達がいれば大丈夫。」
"They don't necessarily have to always be with you."＝「彼らは常に一緒にいなくても良い。」
ご参考に。
アメリカ合衆国 
