I have applied for a data input job
...to...
I have just got an interview for a systems analyst/project manager job
There's a BIG difference between data input and project management! Do you have prior SA/PM experience? Having just secured a new job for a large, extremely profitable bank (which I can't name!) after a search of a few weeks without work, I can sympathise, but I'd be very wary of any company that offers a combined systems analysis/project manager job - the two aren't really compatible - one is hands on, one isn't, and a PM role of any description ought to pay WELL.
I've ~11 years commercial experience but that good PM role has still eluded me (but then, I've never been a 'company man' - that may change if they pay me enough

) so to land it at 23 without a lot of experience* would be unusual. Also, in project management, I've seen some junior PMs find difficulty managing older staff - and, let's face it, that's understandable: if you're 35, you might not like being managed by a 23 year old.
Anyway, good luck. If this fails, have you tried sites like
www.jobserve.com? I've landed most of the roles in my time via that site, and for IT it's really the only online jobsite worth bothering with IMHO.
John