It just stopped working.

So.. i was using it about a month or two ago and it was working perfectly fine and the touch screen stopped working like i would try to push it really hard and it wouldnt respond but the buttons would? like the lock button would work and everything. and now whenever i try to charge it to see if maybe by some chance it will start working or not and it takes forever to load and then it shuts off (while it's charging) and then restarts so it does this over and over again. so i don't know if its the phone or if its the battery? cause i took out the battery and it looks like it's got water damage but the phone doesnt...? could i just get a new battery and it'll be fixed? or is it a lost cause...?