Jemma I'm just like you - I've lived my entire life, gone to university of newcastle and though Im in student accomodation I can get back home anytime I like (in fact I'm here now!). in short, I am quite shy and unadventurous - but I'm still going on a study abroad trip to America for a semester in the Autumn.
Firstly, I wouldn't worry about your lack of skills - even if you do those things at an amateur level then it's always something you can improve on while your there, and there will be others like you who can't do anything and are just there for the experience - the primary reason why anyone should go.
You've moved a long way away from Preston which is more than I've done, that shows bravery in itself. It would look great on your CV if you want to work with children after university, and even if it doesn't. You say you don't do things like this by yourself but that's what this stage of your life is for - I say go for it, try everything and if you don't like it, lesson well learnt.
Truth is you have no idea whether you would suit it or not because like you said, you've never done anything like it before (except move away, and did you settle in Warwick okay?). And even though you don't know yourself, you know a LOT more about what is right for you than your friends. My friends are supporting me in going to America (a couple are even taking the opportunity to have a cheap holiday to America!) and so should yours.
That's if you want to of course. Good luck making the right decision, sorry I can't be more help in the actual experience but if it is too late, there's always next year.