The dudes say she's suffocating. I think she's on the more suffocating side. How to tell her ?

First I would not let my buddies influence me when it comes to my partner & if you are spending all of your time with her then maybe that is where you want to be most of the time and it isn't your buddies business. BUT if you are truly feeling suffocated or if you are just one of those guys who let's their buddies put things in your head then I would just let her know in plain words. Tell her that you would like to have more YOU time and spend more time doing things without her or with your friends. I would be honest that way she has a choice if she wants to be a part of it or not. She may want a boyfriend who wants to spend a lot of time with her and it sounds like you may want a girl that you spend less time with. You two may need to find the person who suits each of you instead of trying to make the other be someone they're not. Smell what I'm cooking? Hope I helped! just be real with her! Maybe she feels the same way. You never know.