15 year old male and it feels good when i rub my nipples normal?

Yes, it's normal. Lots of guys rub their nipples or have their partner do it. You'll get used to it.

Hi there,
You are a teenager and you are in age where you are sexual mature. So this is nothing to worry about. This is a normal reaction. Have you had any sexual experience yet? I know that you are still young but I know also that teenager experience sexual activities earlier then when I was a teenager. I would also advise that you don’t rush things, and you should inform yourself as much as you can about sex and all sexual activities before you engage in any sexual activity. You can try to talk to your mother or father about this, and I know that this is not simple but try to talk to her.

All the best,
Danella

Males and females have many of the same nerves and locations for stimulation. After all, until they begin to diverge in the womb, males and females are relatively indistinguishable, physically. So, many of the same systems are in place.

Many males (both gay and straight) often find stimulation of their nipples pleasurable. This is entirely normal, and does not say anything about your "masculinity" as you might fear. In fact, it indicates that you are more comfortable and accepting of the sensations your body can provide than someone who thinks it might be "weird" or "wrong" or "perverted". Don't believe them. Enjoy the sensations your body can deliver, and add them to the repertoire of sexual techniques that can turn you on.

And the "stomach ache" you describe having a few second after is most likely your abdominal and pubococcygeal muscles tightening to lead you toward an orgasm. Try continuing the stimulation and see what happens. Don't worry -- you can't break anything!