Information on acting?

[Cogito]

It's going to take several years at your acting class, and loads of stage experience before you're ready to even think of headshots and agents.
Agents only ever want very experienced and very well-trained professionals. School productions don't impress anyone - you'll need stage experience in community theatre or a good local drama group.

Your parents are right, in a way.
You're highly unlikely to ever make a living through acting - that's incredibly rare. Almost all actors work at least one other 'ordinary' job to afford to live. They just keep it very secret and certainly don't admit to it!
Make sure you have enough skills to get a good job you can work free-lance so you won't keep getting fire by an employer for taking time off for auditions.

Being a hard-worker and having a great memory is great - but just two areas at which you'd need to be seriously talented. I know a student actor who can memorise a whole play in a day or so - but he's a terrible actor. He's wooden, can't project, moves awkwardly and his general education isn't very good.

Forget about the headshots for now. Concentrate on your schoolwork and acting classes.
Learn to sing and dance as well - they're really useful.
Good luck!