Hello and welcome!
You can check you LFSWorld stats on
http://www.lfsworld.net/?win=stats&racer=Schumarker or clicking the small
icon below your username/number of posts on the left.
The reputation that you mentioned is quite likely the LFSEI, Live For Speed Experience Index which is calculated by Airio (a third party application) based on a number of stats from your races/uploaded hotlaps.
Ideally you would find your own LFSEI info here:
http://stats.airio.eu/EXD.aspx?U=Schumarker. But if I recall correctly, if the Index is less than 100 points (i.e. for a new racer) it would not be stored. You will [hopefully] see it once you get more than 100 points.
You can see how it is scored by checking out another driver, in this case the one with the highest LFSEI:
http://stats.airio.eu/EXD.aspx?U=fm-failure.
In-game you can type
!ex
(on some Airio-powered servers) to see the LFSEI info of the people connected at the time (incl. yourself).
Most of the players are alright and generally helpful; but there are some bad ones out there - so be prepared for a bit of swearing, crashing and general bad atitude aimed at yourself. Don't let it get to you - just drive your best.
See you on track!