The onset and duration of this voice change can vary from person to person. In general, it begins between the ages of 12 and 15, and it may take a few years to fully complete. During this time, it is not uncommon for boys to experience a range of vocal qualities, including a "cracking" or breaking voice.
While it is normal for boys to sound like girls during this transitional period, it is important to note that not all boys will experience a significant change in their voice. Some may have a more subtle change or may not change at all.
If you are concerned about your voice or if you have any other questions about puberty, it is a good idea to talk to your doctor or a trusted adult.