At your age, 135-140 over 80 should be fine. You may be a wee bit high for your age range, but not overly.
Gum redness can arise from not flossing regularly. My gum bleeding reduced to under 10% [which denotes no active gum disease] when I started flossing 2x daily, and brushing my teeth 2x daily with a Sonicare electric toothbrush, that has a 2-minute timer [one minute for my top teeth, and one minute for my bottom teeth, and I try to brush as evenly as possible].
The electric toothbrush with a timer was a godsend in terms of reducing my gum bleeding [and thus bringing me to zero gum disease, and reducing the redness of my gums]. Flossing 2x daily was also important, and I think if you go much over a 2/2 protocol, you risk over-brushing.
I can't speak for the white puss coming out of your gums. I've never had that, or heard of it.