I am applying for sales assistant jobs and I have 9 months previous experience, no one is giving me feedback from my rejected applications.
If you have experience, perhaps you could present it in your CV and applications better. Like others have suggested, get your CV checked by a friend or teacher (or you can even use the CV Help forum on TSR!) to see that it reads well and shows off your skills.
You could also consider other types of role that which share the same skills, for example, working in the food and service industry.
. as above if you are not getting to interview there is a problem with one of these . or you are applying for jobs that are way above your experience!?