Who knows? Your parents might be more understanding than you think.
You could try writing your own spell that doesn't need any materials or materials that are difficult to come by. With enough proper education that wouldn't be a problem. You need to learn more about spell craft and how spells work. You don't necessarily need to study meditation, visualization, energy flow, or grounding extensively to be able to cast a spell successfully but those topics certainly will help you understand preparation for spells. Preparation is no less important than the actual casting.
Also, I wouldn't recommend casting spells for no apparent reason. Every time a spell is cast the caster is asking for a change in what would have otherwise been. Every successful spell has consequences; sometimes all are desired, sometimes all are not, often times both. Unless you are willing to deal with the possible aftermath that is within your capacity then I would suggest thinking twice about casting a spell. This is frequently a thought that might put off beginners which is why many are urged to learn the craft long before attempting to actually cast spells.
If testing a spell or your own competence is the goal you really don't have to go through a spell to accomplish that. You could sit down and map out how the spell will work:
- What you'll do to prepare for the spell
- When you should cast the spell if you are not happy with the suggested timing or if it is not specified
- Any dedication to specific entities you'd like to add
- What you could do to help the spell work after you've cast it
- What kind of things can happen because you cast this spell and did not specify while casting it said happenings
- What you can do to resolve any issues that you might see arise
Theoretical spell craft can help you when it finally comes to actual practice.