Andre, John is right, its a problem pretty much all of us have at the start, regardless of how our fingers are shaped.
There is a lesson where Christopher explains how to learn new chords, and I think a lot of people miss the importance of what he says. In a nut shell, to learn a new chord:
-place one finger at a time. Start with just one, strum all the appropriate strings slowly, and listen for any bad notes or buzzing. When it sounds clean, add the next finger.
-After adding the second finger, strum slowly again. If you hear a bad note, or some buzzing, remove the finger you just added. Backup, and find where the problem is. Add the finger back, strum again. Repeat until you get the notes sounding cleanly.
-Repeat this procedure until you can slowly strum the chord and all the notes sound cleanly. Eventually, you'll find you can make tiny adjustments without removing your fingers from the fretboard, but the point is, GO SLOW and get each note right before attempting to add the next.
You may run into the same problem trying to switch between chords:
-first, make sure you can play all the chords cleanly.
-next, strum one chord, play it clean, then switch to the next chord. Take all the time you need before strumming. Do not worry about tempo at this point. Only strum the next chord when you believe you have it fretted properly. If you get bad notes or buzzing, trace it down like you did when learning the chord.
-you can add a metronome and try strumming & changing in time once you have the chord changes down, but don't try it before hand. If you try to force it, and just play through with bad notes and buzzing, it will take you a lot longer to get it sounding cleanly. Playing the notes, and then the chords, correctly every time, regardless of how slow you have to go, is the fastest way to learn them.
Good Luck!
