I'm a 18 year-old girl who can't help but notice that she's turning into a such a bad muslim. I'm praying my salah until the last 5-10 minutes are left and sometimes I even miss prayers and pray them late on purpose, I don't wake up for my night prayers anymore. My attitude is becoming so bad too, I'm lashing out on people, swearing, and becoming so short tempered and impatient. I'm disrespecting my mother, I'm listening to disgusting music, I've stopped trying to learn the Quran, I'm watching filthy things on the internet having shameful thoughts and even saying bad things about the sahabas, things like "what have they done for me?" and "I don't care about them" I'm being hesitant with money and have stopped donating money.
I sin so much on a daily basis and I feel so guilty about my actions that I cry almost everyday about them. It's getting so depressed and sad, being at ease seems so impossible, I just feel suffocated with guilt. I repent but I don't do it with sincerity because I'm so lazy, I just say "I'm sorry Allah" and end it there.
How do I go back to how I used to be? I don't even know where to start because things started to go from bad to worse and then everything about me changed so fast. I've tried to change but I really can't.
Sorry if this may seem like a petty question/concern to you guys but I really need some advice on how to change myself because I'm beginning to hate myself.