Breaking Up

So today I tried to break up with my girlfriend. I sent her a message in the morning saying we need to talk and that I don't really want to see her anymore. I went to her place to talk and she started shouting at me and stuff and crying and i felt bad. We ended up not breaking up. We had a great time with the rest of the day and she said i love you i struggled but i said it back. We made out and stuff as usual but we were doing the same stuff that made me want to split up with her. All we ever do is sit in her room and make out and whenever i propose something else theres always an excuse not to or if i ask her what she wants to do. I have spoke to multiple friends, mix or girls and guys, and they all say I should end it. Even my parents agree. There are many other reasons. Another main one is shes my first girlfriend and i want to experience more. I wouldnt be saying that if i was head over heels for her but the truth is im not and we have been dating a few months now. When im around her im fine but when i leave i realise its not love i am feeling its lust.
Anyway the whole point of this is to ask. How am I to go about breaking up with her?

-note 1: in a flurry of guilt and hormones i promised id never break up with her after today

-note 2: ive been trying to act a little detached on text so it doesnt surprise her so much

-note 3: Is it bad to try and make her want to break up with me. It just hard to do that

-note 4: she is very into me and it would be very bad if we broke up for example she has pictures of us on her walls and she is logged into my social media.

You shouldn't feel emotionally blackmailed into staying with her. If you don't want to be in this relationship, both of you will suffer … and she'll end up hating you even more than she would if you'd just broken up. Breaking up with your first gf or bf is always hard but the other person will eventually get over it. You're going to break up with her one day, you might as well break up with her now before her feelings develop further.
Distance yourself for a bit but don't do anything drastic to make her want to break up with you (e.g. Don't kiss another girl). If you don't love her, don't tell her because you're gonna give her a false sense of hope … just say "I know" or something like that (that's what I did when my bf said it to me but I wasn't ready yet)
When you break up with her you should try to give her an explanation, but not in a negative way - don't tell her she's boring because she only wants to make out, just say you want to try other things or you don't think you're ready or whatever.
Maybe switch your passwords for your social media so she can't access it too? x
Good luck