The issue is that you might well not be able to identify a man you’re dating as a creep, even if he is. So, men could take advantage of you and you’d find it hard to realise what they’re doing.
I don’t think you were misdiagnosed. I think perhaps you’re struggling to understand exactly what the diagnosis means, and what it means for you personally in your life. I suggest you ask for help in understanding it, and what concerns your mom and your support workers have about you.
If you’ve passed a sexual consent test, you can sleep with whom you like, but you’d be wise to let your mom and others meet the men before you sleep with them so they can give their opinions. If you dont do that, you could be taken advantage of, but that will ‘only’ harm you.
What you can’t do is just decide to have a baby - because you lack the capacity to make that decision with full understanding, to live independently, and to care for a baby. This baby would be a separate human being to you. You’re not entitled to act in ways that could harm it or mean it’s neglected or not cared for properly.
To some extent you can make bad decisions for yourself (sleeping with men who are taking advantage of you) but you can’t make bad decisions for another person (a hypothetical baby).
I know the test results must be upsetting, but the fact you can’t accept them and can’t understand why they’re right, can’t understand why you have the guardianship, can’t understand why your mom is right to insist you keep the IUD in, etc, show that the test results are correct.