Coming from Europe and thus being able to compare, this platform (LOTA is more than just a league) is certainly one of the best well organized platforms I've been working with and a great meeting place for all LFS fans (both starters and experienced racers).
Simple, your onboard graphic card is just too slow (and limited) to actually play games with. Your current fps is for ~99% based on your cpu. Overclocking of your graphic card may make a (small) difference, but generally spoken: that graphic card is unable to deal with games.
O btw about the cpu usage: LFS is a single thread game and thus only uses 1 core. Basically it is using 1 core for 100% and the other core for ~0% (depending on other processes running).
Yes, Banshee sure cranks up the average age of a team :P
But age does not has to be a problem, it is all about how serious and mature one is to race. If you can race in a competitive, respectful way, a lot of teams will consider you as a future driver. After all 'older' and experience will come with time
Along with that what Banshee and Marsh already have said: looking at your stats (which for practically all teams serve as a first impression) you just started your LFS career. Is it strange that teams won't let you join at this particular point. For most teams speed is not the only issue to select a member, but also loyalty, activity, behaviour on and off the track etc. Something they cannot judge at this particular moment in time. So don't be upset or think no one wants you, just go race with them and make them notice you in a positive way.
About teams at LOTA, like Banshee said you can team up with any other driver. As the only NA 1ST racer I teamed up with a racer whom didn't had a teammate either (LOTA Rally). If the M-GTR cup has the setup, it would be nice to have a teammate (hint ;P).