Girls only - please I need your opinion!

I really want to have a fwb relationship with someone around my age but I have strict parents - I'm almost 18 and I feel like they will judge. If I keep it as a secret, would it be disrespectful?
Please guide me on this. I'm panicking and I want to have this but I know I'll hurt people.

Just keep it secret from them or tell them that you are nearly an adult and you can do what you want. Good luck

experimenting is so valid and important so if you think you should do it then do it but don’t hesitate to talk to people if it goes wrong and you need advice

First of all, realize why you want to have a fwb relationship, be true to yourself... knowing the reason will help you a lot... you are at the juicy part of your teenage where you want to try new things and the age where you find daring things interesting and the age where you have the YOLO attitude. you must be careful because some lead to memories but most leads to regrets...
I would suggest you talk to your mom about this or an elder sibling if you have one.. this may sound scary but they have gone through the same phase and also have seen more of the world than you and are the best people to talk about your feelings if they are overwhelming ... dont go to a friend for advices on these because they just want to see what happens to you, they are just there to enjoy the show

Why would you need to tell your parents anything about your sex life, let alone a fwb situation?? Just do it and don't tell anyone, simples.

keep it a secret and once the relationship starts getting serious tell them

I get that, the thing is, they would most likely find out surely. If they do, what do I do? I'm feeling so guilty because they make me feel this way constantly - I really want to do it though.

Well it’s time to up your sneaky mode and maybe they won’t find out about your sneaky link. And so what if they eventually do? As long as they’re not going to kick you out or disown you then just go for it. Sooner or later they’re going to have to accept that their child has sex.

Most parents don't want to know about their children's sex life, so don't worry about what they think. There's no reason they should find out unless you explicitly tell them.

Mine apparently have to know every single detail in life. I understand they care. I'm fortunate but I can't cope.

Would they be open to the idea of you dating someone? You can imply that you don't do anything beyond kissing.
But you are almost 18, as long as you trust the person you are going to meet, you are old enough to make your own decisions.
Maybe tell a friend where you will be going, just so someone knows where you will be in case something happens.

I've come to the conclusion that I shouldn't take the risk because I mentally can't take it and would rather satisfy my parents. I would be better off being in a long-term relationship but still they'd be controlling over that, so I can't win but they'd approve that more.
I would have loved to have done the fwb but my parents will be hurt. I overthink so much and I am never happy because all I do is satisfy my parents.

Are you going to university next year? If so, that will give you some more freedom and space.
It's good to want to be close with your parents, but make sure that you aren't pleasing them at the expense of your own happiness. You are your own person, not just their daughter, if that makes sense.