First off, let me welcome you to the world of Red Eclipse, I'm glad you're enjoying your time here.
As for your problem, well, yes, the amount of players is often quite small (you can see how many players are online where on some website I forgot, hopefully someone else can link it) and this is often annoying if you want to play. Luckily, there are a few ways to "solve" this.
For starters, you could invite your friends to play with you, maybe even invite them over to your place (assuming you have cool friends who like cool games). You could also play online against bots, or you could join the Red Eclipse IRC channel (#redeclipse of FreeNode, you can quickly connect by clicking here:
http://www.redeclipse.net/chat) to see if there is anyone online who would like to play with you.
Of course, these options don't always work out, and unfortunately the community of this game is somewhat small so, if you have the opportunity to promote it a bit to people who live in your timezone, you will have more people to play with.
Unfortunately, these are all the tips I can give you, so I hope they work out for you well enough. Hopefully I'll be able to see you in-game once =^.^=