im fourteen and i dont want people to say wait till your older youtube tutorials dont suit me and im having trouble finding a course that actually has assignments and teaches with applications such as dreamweaver, etc. i ahve basic knowledge of html and css. it has to be an actual course where i get assigmnets and a exam.

If you are in US and if you have specified the location (city) then finding a web design/ web development institute (affiliated) would have been more easy to answer.
As you are fourteen you have to complete your schooling before you move to graduate college. Rather than certification you could go for institute that offer assignments and conduct exam.
I am sure you can contact them and find solution:
http://www.webucator.com/webdesign/index.cfm
http://www.webdesignfromscratch.com/ - good resource for beginners
In demand is Microsoft Expression Engine: check many course offered - http://expression.microsoft.com/en-us/dd252934