Regardless of your sex, it does not make you vain if you want to improve your appearance. If you think it will make you look better, which will lead to feeling better about yourself, why not?
Maybe you can post some pictures and get opinions of the board members.
Cheek implants can be a tricky procedure, as most docs tend to put in implants that are too large. I doubt you'll end up looking like Priscilla Presley. Her cheek implants are bad, but she has had a plethora of botched (and many unnecessary) surgeries.
I also got the following info from
PlasticTastic.com "It is rumored that she (Presley) went to Dr. Daniel Serrano (or "Doctor Jiffy Lube") around 2003. Apparently Serrano was a good-looking Argentinian who gave some of Hollywood's most famous leading ladies what he claimed were miracle injections that worked better than Botox. Wouldn't you think that these women would have done a little more research? Serrano did not have a license to practice medicine in the US and used low-grade silicone similar to auto parts lubricant which caused lumps and loss of movement in many of his patients...er victims."