I'm 50 years old, and I've been giving my friends (both male and female) full body massages for more than 30 years.
There's *nothing* about doing nice things for each other's bodies that anyone should think of as "wrong" or "weird".
*If* it should happen that the things you're doing together become something sexual... well... then there are some decisions you both have to make and you should talk about them with no more embarrassment than you had while massaging...
... but if that's not the case, all you're doing is *massage*. It's *GOOD* for you both. ENJOY.