So, Francis, from what you've written, it seems that you can't talk to your mother about any of this. It's water under the bridge now but your mother shouldn't have been bringing a steady parade of boyfriends into your life.
What about your father? Is he involved in your life? If so, did you ever tell him what was happening?
So...if you can't talk to either parent about all of this, then that leaves you with talking to either; 1) A trusted adult that you know; 2) Your guidance counselor; or 3) Someone at the hotline. Whichever you choose, please get going! You don't want to look back years later and regret not getting help. Help is there, please avail yourself of it!
I hope the next time you post here it is to tell us that you got the process going.