Welcome aboard, Blake.
Full-time students qualify for a special $35/month rate.
This part of the rules cover those under 18:
The DMS is not a day care.
Minors 15 and under must be accompanied closely by Parent or Legal Guardian at all times and are not allowed to have keys to the space.
Accompanied closely means visual range generally, and immediate reach when near dangerous tools.
Parents/Legal Guardians are responsible for their children and their actions.
Minors under the age of 18 must have their liability form signed by a Parent or Legal Guardian.
I am not familiar with the process, but I think you can take a copy of the form home to get them to sign it.
The several committees may have other rules. For example, Machine Shop will give you full access rights to the Sherline lathe and mills after you have taken the mandatory training classes.
Browse through the information for the several committees here: https://dallasmakerspace.org/wiki/Category:Active_Committees
I am not sure, but I think you may be allowed to use the 3D printers and laser cutters after training. Maybe even the wood lathes. You will find no age restrictions for you in Electronics.
We also have an honorarium program in which you can get paid $50 for each qualifying class you teach. That can pay for your membership.
We no longer have an active aerospace committee, but three long-time members of the Dallas Area Rocket Society http://www.dars.org are DMS members. We usually have a rocket build session here at least once a month and you do not have to be a DMS member to come to those. The next one is Jul 10: https://calendar.dallasmakerspace.org/events/view/5544