My thoughts, as always with these type of threads take my style with a pinch of salt as it usually appears critical/confrontational, but it is intended to be constructive in terms of highlighting potential areas for improvement:
-Convert some of the paras to bullets
-No grades listed for your A-levels (the most advanced qualification you currently hold) sets alarm bells ringing i.e. I would rightly or wrongly assume they must be very poor otherwise you'd have mentioned them
-In the experience section the use of the phrase "in hindsight" is bizarre; it implies that perhaps you had not planned out your enterprise well enough or were caught by surprise [as opposed to giving the impression that you are well organised and can adapt seamlessly to any changes]
-You need to go over everything you've written again to optimise sentence structure as some of it doesn't read very well. E.g. "I have a keen in music production which played a part in choosing this course"... a keen what? Female associate?

In general, it feels like you don't use enough commas in your prose, so you often end up spreading a single point across two sentences.
I would recommend taking a step back and focussing on the key things that your CV should be promoting in relation to the type of role you are applying for (NB I'm not suggesting the below should be headings):
-Relevant skills (HTML, CSS, Java, SQL)
-Relevant academic study (Multimedia Computing UG, ICT A-level, ICT GCSE)
-Relevant work experience (technical design authority role on Young Enterprise scheme, building and installing PCs)
-Noteworthy experiences outside of work (Managing football team, music production)
Get those things across in a concise and well-presented way and you may be in with a chance; at the moment it is mostly hidden away in the wall of text. Make sure you summarise them somewhere (e.g. covering letter).