I used to be very socially awkward and full of self-doubt like you when I was younger, but have since made a big flip and even been called the "social butterfly" so here's a few hopefully helpful things from my experience:
* The most important: some people will not like you - and that is normal. It just means you have a personality
* Conversely, some people will like you for the reasons others dislike you. My friend is notoriously too quiet and talks under her breath, making her hard to hear; I wish her voice "would carry" like yours more simetimes!
* Over time you will find people who like you for who you are, and those who don't like you for who you are. The former are friends, the latter are... not friend. but not enemies either.
* If you can accept this, it will make you confident in yourself.

That being said, it's not an excuse to be mean or ill-mannered and sometimes feedback from others is legitimate. But it sounds like you way, way overestimate that. Accept yourself and the people your personality attracts first - if you like them as well, things are going right!