First time poster and some "problems" for a stutterer

First time poster and some "problems" for a stutterer Hi, I've stuttered my hole life. Got a little better since my childhood. When I was a child I only had the "repetitions-stuttering" (li-li-like this) but nowadays I mainly have the blockage of words that just won't come out. Nowadays I could say that I stutter a 2-4 on the scale 1-10 in public depending on where, when and how stressed/embarrassing the situation is. But with my family (especially my brother) I stutter "like a maniac". I've always thought that's because I'm so comfortable with him that I don't care and it's probably that. I've dated a girl for over 2 years now and as I guessed in the beginning I didn't stutter much, but as I get more and more comfortable with her the more I start to stutter. So to my first question: I've never really talked to anyone about my stuttering and I feel like if I talk about it with my gf, some kind of band will be broken and I can never return to the "unknowingly-phase" that we have now. I don't really want to talk about it, but I know it's going to get worse and worse when I get even more comfortable with her. And I don't want her to think and feel sorry every time I'm about to open my mouth. So what do you think I should do? And for my second question for you guys. I somehow get really embarrassed if someone around me stutters. I had a friend of a friend a few years I go when I noticed my embarrassment. I feel so sorry for them that they "suffer" this also and I don't want them to talk. Always when they're about to say something I blush really hard and hope that they won't stutter on their next sentence. The worst was when we had a presenter in class that stuttered. I've probably never been so embarrassed in my life. I blushed and it felt like everybody was watching me. Does any of you feel this way that you get embarrassed when you talk to another person that stutters or hear another person that stutters or just talk about stuttering? I wanted to post this because my brother has started to date a girl that stutters a bit. He's probably the best person for her because he's been with a stuttering person (me) for his hole life already. BUT I get so awkward when I'm spending time with them..... Why? What should I do. Especially when we go out for dinner and we talk freely and she stutters I blush and get sweaty and everything. Am I too caring for her or what is it? Should I talk about this with my gf, my brother, my brothers gf or not talk to anyone? And sorry for any language errors, English is actually my third language.