I hate this

Hello everybody!

I'm having a hard time this year because I'm finishing 8th grade and I still don't know in which school I will go after 8th grade.I don't know how it is in your country but here after 8th grade we're going in secondary school(high school),you have to be 15-16 years old.The problem is that I have no idea in which type of school to go.Every school is specific for some job so I have to pick the school with job I want to do,I don't know how to explain it better.I'm not perfect at school like all 5(A's if you are from UK).
Some subjects I'm not good at:

• Maths
• Chemistry
• Physics
• Croatian 

and most of school are asking for those subjects,I just can't somehow learn them.It's almost the end of 8th grade,few more months and I still don't know what I'm gonna do in future,it all depends on school I will go to.Everybody is asking me "In which school are you going?" and I'm like "Oh I don't know yet...um".I need some serious help here,now if you ask me what I want to be in future,this will be answer "I want to be youtuber or professional blogger just like Zoella,Alfie,Jim and other youtubers,I want to live like them but it's hard because there is no school for youtubers or bloggers.All I'm asking for is HELP from anyone,I need help,even my parents don't know in which school I will go because for most stuff I'm useless expect for eating,sleeping,blogging,talking to complete strangers and do some manly stuff.

If you have any idea PLEASE post in comment,it would mean everything to me :)