Why can't anyone believe I can be a good mother in the future?

I've been ditched or rejected by 2 past bfs and a date when they found out about my violent past towards smaller kids and other destructive acts. They judged me even though I was 10 years old the last time I hurt a small boy (reason: boredom, hatred, control, thrills, power). Yes at the time I did told a psychologist ''I like hurting things and kids weaker than me''.

I've been dating my current boyfriend for 6 months now. He knew my past on the 2nd month and even though he said he won't dump me over it, he wants to take things slower than usual given my past. I just wish he would trust me to be the mother of his future kids. Who I was back then isn't my current self anymore. I haven't hurt a single soul since then. Why is it hard for other to believe I can be a caring, loving mother? I can.
Why can't anyone believe I can be a good mother in the future?
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