It would help with that, there's a lot more to voice than pitch, and pitch isn't even the most important factor for a feminine voice. More feminine voices tend to be thinner and have a different resonance compared to masculine voices. You might find that a little work with those two factors could already have your voice around where you want it!

Also wanted to add that I've fallen into the trap of whining more because it raises my pitch and I like how it sounds. Luckily I'm also known for being sarcastic so they balance each other out.