I learned to play guitar by finding chords on the internet and play them. When i was comfortable with the chords i tried to play it while i heard the song.
I've never played anything but guitar. As a child i really sucked at music (couldn't play anything, and i couldn't sing either).

Today my biggest problems is "playing by ear". I can't. I've tried to practise it a bit by playing really easy songs, but even that's hard for me.
I can still not sing. I'm am in a four man band, and the three other guys sings actually quite good, and it really buggers me, that i'm the only one not singing when we play.
Are there other guitarists out here, who is a bit "tonedeaf"? Any guys who got some advice?
I love to sing, so it would be nice not to sing out of tune. I love to play guitar, but even easy things take alot of time when i have to learn by playing tabs.
 Any help would be appreciated