Hi, I'm year 12 going into 13 and I have some questions regarding where to go to uni

I'm from a small county in the South, and was looking for unis similar- so campus unis, small, safe, preferably not busy.
I've been researching and I'm pretty in love with Chichester Uni. It's campus, small, safe, has community, and it's psychology course is BPS approved (what I want to do) I'm going there on a school trip on the 17th and I'm very excited
My problem occurs when I say this to the adults around me. My mentor and other teachers at my sixth form say I should aim higher than Chi, and look at a Russell Group. (I'm achieving A-, B+ and Distinction and got some 9s at GCSE)
I aim to become an educational psychologist in the future, which requires a doctorate course after my undergrad.
I also went to a UCAS Discovery event recently and didn't talk to any Russell Groups because I didn't believe in myself, it's only now when teachers have seen my mocks and my progress are they really pushing me, I always disregarded the Russell Group advice before now.
So, with this in mind, should i abandon Chichester for Russell Groups? Does going to a Russell Group matter considering my future? Chichester isn't ranked too highly, so how much do rankings matter?
I also don't want to go too far away from home, my closest Russell Group is Southhampton- does it all matter?
Please help, any advice is appreciated (and sorry for the essay!)