Congrats on being accepted!! I just committed to LMU. I may not have attended it yet but I am pretty sure I’ve read enough reviews about these concerns of yours to say something.
Yes, there are parties at LMU and sororities/fraternities are big at campus. However, if you’re not into that it’s completely fine. From what I can tell, LMU has an incredibly friendly and accepting environment (big reason why I am choosing to attend), so I wouldn’t be too worried about that.
Also, students are only allowed to rush in the second semester. So basically you and everyone else would be in the same boat. + and there are no frat/sorority houses. So even though Greek life is present, I wouldn’t classify it as the traditional Greek life.
In regards to fitting in and finding your type of people, the secret really is to join a few clubs and get involved on campus. Everything works out in the end 