For somebody so young you are really asking complex questions.
First, voice surgery should be a last resort. My male voice was about one of the lowest male voices possible. When my male voice dropped, it also took the upper end with it making the highest comfortable voice I could use below the female range.
The best place to start out is with speech therapy. There are 4 voices a person has and of that the lower 3 can be used as a voice. The top one is uncontrollable and can be used in some types of singing but not for voices.
Males tend to speak in the chest voice where as women speak in the mouth/head voice. It is simple to do as all you need to do is tighten up the muscles above the Larynx when you speak. For some people, this is enough to put them in the female range. One word of warning. If it hurts, stop doing it. A hurting voice indicates you are causing damage to the voice and if it can be corrected, it will be costly. The next voice up is the Falsetto and we will leave that alone for now because you need to use the mouth voice well before moving into the Falsetto.
The mouth voice is the key to all female voices. Women use it naturally. For a male to do a female voice, they must do it and most important, when I get my voice back after surgery, I will normally use the mouth voice to control the surgical voice. I am unsure if I will use the Falsetto voice because I don't know if I will need that much upper range. If I do, I suspect it will be for an excited voice or baby talk voice.
There is software for a PC or smart phone that can help figuring out where you are as well as using voice recording web sites so other can share in your progress. It also is possible that your parents can lend an ear as well.
Hopefully your voice is still high enough that speech therapy will do the job. By the way, after you use the mouth voice for a while it becomes locked in and it's hard to return to the male voice.