Before you even get to the key you would like your guitar tuned to, your strings keep breaking.
Before you decide to give up and throw your guitar across the room, take a look into how you are actually tuning it. There are times when you may be tuning the guitar, and there is some background noise that the tuner may be picking up on and it could be throwing it off. Try simply moving into a different, more quiet area and tune the guitar from there.
Just like most electronics, if the device is not receiving enough power, there is a chance that it may not function correctly. Sometimes a tuner may read a note as being flat when it may actually be right on key or sharp so this causes you to continue to tighten your strings until they pop. Take a look at the tuner and see if there is a "low battery" signal. If not, it still doesn't hurt to just replace the batteries.
In some cases, if your strings continue to break, there is a chance that you may need to adjust the action of the guitar. The action of the guitar causes the neck to bow forward or backward depending on if you loosen or tighten it. If the action is thrown off, this could cause extra stress on the strings causing them to break.
One simple solution.
As crazy as it sounds, some people think that to tune their guitar to anything other than standard, they have to go out and buy a different set of strings. This is not necessary. Have a tuner handy, or even find a sound clip onlinesuch as this one of strings that are in tune, and match up the sound of your strings with the key that you desire.
I just tuned my guitar to where I want it, but now when I play the become flat.
A lot of times, when you just change the strings on your guitar and tune it to where you need it to be, when you go to play the guitar, the strings become untuned before you ever even play one song. The problem is that when you replaced your strings and passed them through the bridge pins, they haven't fully been set into place. Until the strings are snug inside of the pins, they will always be moving. The best way to fix this issue is to continue tuning your guitar and pressing your bridge pins down into place if they begin to rise up.
Although not very common, there is a possibility of the strings you bought being faulty strings. If you have gone through and made sure the bridge pins are securely in place, go through and examine the strings carefully for any defects. If there is any question to the integrity of the string, return them to the distributor and try to get a new set.
Are these the right type of strings for my guitar?
There really is no right or wrong type of strings for your guitar. For this type of guitar, when you buy new strings make sure that they are made for acoustic guitars only. There will be varies amounts of options under this type of string, but none of them are really wrong. To know if you have the right strings or not, test some out for the sound quality and feelings on your fingers to see if they are right for you.
It hurts my fingers to play because they are so high.
This is the most common problem for the strings of a guitar to be too high off of the fret board. The good news is that it is a relatively simple problem to fix.
If the action on your guitar is too loose, this may cause the strings to bow forward and place the strings higher off the fret board than you make like. Locate the truss rod on the inside of the guitar and tighten it until you feel the neck of the guitar moving. When the strings are at a comfortable height for you to continue to play with, stop tightening the truss.