simple...you need a Digital SLR camera.
check out the Nikon D50...if you can find one in stock.
The lens aren't that fast but you can shoot at a faster 'film speed' and still get decent results when shooting the sports your talking about.
The other solution when using the type of digital your shooting with is to use it's rapid fire mode...burst mode....usually it will help you capture a few good photos with each 'burst'
The video clip feature of many non-slr digitals produce great video clips you can view on your large screen TV...there fun too.