How old are you?

If you're still young the guitar may be too large for your hands, a 3/4 size might be better suited to you. It also may be the string height, if they're too high it takes more strength to get the strings sounding correctly, maybe see about getting it set up.

It will take weeks to get A major, G major and E major down. Then a little less time for the others. Just take your time, make sure each string sounds correctly. Then let go of the chord and go back to it. Once you have A, go to E. G is much harder.