Hi Kai,
A week clean is fantastic; here's to keeping the streak going. :)
I understand about being worried to tell your parents. I don't know your parents or your relationship with them, so I can't say this for certain, but if you ever feel ready to talk to them about it, it can be a huge weight off your shoulders to not have to keep this secret from them. That being said, not everyone has parents who understand these things, so it will have to be up to you to decide if and when (if ever) to open up to them about this. But I do hope you have someone you can talk to--if not them, perhaps a friend, or a therapist or counselor.
In any case, it is true that sometimes it just makes more sense to cover your scars than show them. I've written a few posts about cover up options; hopefully you'll find some ideas there you can use:
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2022/3/hiding-self-harm-sca…
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2021/9/self-harm-scars-in-t…
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2021/7/self-harm-scar-cover…
Take care and best of luck,
Kim