a really deep one.

I was born with a really high/pitchy kind of girlish/kiddish voice which has damaged my confidence way to much. When i was a kid i got bullied and laughed at a lot because of my voice, untill around 2/3 years ago. Now it's been 2 years that it somehow changed and it's normal. The problem is that my confidence has already been damaged so much and it's really hard to heal. I was laughed so much that even girls i talked would point out, ask and some even laugh.
I've actually improved slowly the last 2 years but i need more help,
If you guys know a good site especially for that a book, or even a personal advice, it would help me a lot.

Leave the past behind completely and be in the present. This means, don't think about it and focus.

You can try practicing using your voice. It can be deepened with practice. Record stuff with a mic and listen and correct. Play it to trusted friend if needed.

You can use your voice for your advantage if you want. Be confident in your uniqueness.