Can a registered sex offender life with his own children if the charges/plea resulted from him molesting them?

It’s possible, just depends on the terms of the deal.

I'm a 17 year old who wants to date a 14 year old girl I'm a junior.and she a freshmen.I turn 18 in may and she turns 15 in july

Dating is not illegal. Sexual contact with a minor is illegal, minors cannot consent.

I took a plea can I have my case re-opened, or can I file for a Motion for Appropriate Relief?

The time to fight your case was a year ago. Based on her recanting statements, I see no appropriate form of relief because YOU entered into a deal,...

You go and talk to the judge. You might want to start with the probation officer

Can I become a police officer if I get my records expunged?

You can’t erase your record, hate to be blunt but I don’t think any law enforcement agency will consider your application.

If you are given 15 to life, is it probable to say one can be out in 7 years, on good behavior?

No. Absent a change in the law or a successful appeal, tHe earliest a person could get out would after serving 15yrs.

II have been scammed ?

Call the police they’ll determine if a crime has been committed

Yes. Causing property damage and leaving after an accident without notifying the owner or police is a criminal offense. Hit and run.

What can i do?

You should stop talking to this person, ignore them.

How can i dismiss my case disorderly conduct?

This won’t go away on its own. You’ll need an attorney. Best of luck