Well, join the club!

I had the same problem when I strated out. The problem you're facing is lack of streching in the finger. This is absolutely normal at first.

The thing is you're asking your fingers to strech in ackward positions. This will only become better with time. As you play more and more, your finger will strech and you'll be able to play lots of chords.

It's always hard at first to get use to these new positions but don't fear, it's the same for all of us.

You'll also find it harder to play on an acoustic guitar then on a electric. For this reason I always recommend learning chords on a acoustic first. Then when you play the electric, you'll have a better control of your chords.

hope this helps you out.