Yeah I play bass/keys/drums and I sing. Also play a few wind instruments. Guitar is something you get better at when you play with people that are better than you. What catapulted my imrpv (lead/solos) was purchasing a Boss RC20 loops station (I have a couple of them actually)

example: http://www.youtube.com/watch?v=3cuFJCwgTb4

Allows you to play a rhythm down and repeat it so you can work on your solo phrasing.