Q: Lines popping up on screen Preventing phone usage

About a year ago I had got an I phone 6 for my 16th birthday. Only a couple weeks later my phone had got stolen from the park, and it took me til October to get a new one. So anyways during April of 2016 me and my friends went to Knots Berry Farm for spring break and because they are a couple and as single as one can , on the log ride I had to get on with a bunch of strangers that I didn't know, so I decided to call my crush and talk to him for a while on when the big drop came I obviously didn't want my phone to get wet on I dropped it on the bottom on the cart. So thankfully it didn't get wet but it didn't break a little. then later on I dropped it gain when I was recording something at this party I went to cause someone pushed me. So now Ive been having to deal with the cracks all over my phone and slowly the pieces started to come out and now it got even worse. It had been getting these lines down it VERTICALLY and it dosent really let me use it often. LIke it while temporarily freeze on me so i lock and unlock it and occasionally force restart it cause no matter if its frozen or not i cant turn off my phone.

i have came up with one theory that my LCD is wearing out and that i need to get a new screen and all will be good. but i cant be too sure