I can understand your pain. People do stereotype because humans are not perfect they have flaws.
What I would do is take whatever you can from this as a learning experience and do what you can to leverage that and get to the next level. When you work as a team this is going to happen, but when they face the next test, people will know who the real expert is. I wouldn't waste my time worrying about this.
I would showcase the expertise and demonstrate passion for the subject, I would start with a blog and share innovative ideas, just create something great by myself or with a team. I wouldn't worry too much about who gets the credit, it is always better to give, be generous in your giving and help others as much as you can, because that is good karma and it will come back to you, the world works in a weird manner, what you give is what you get, because humans mirror others, if you talk to someone in a calm and composed way, that is how they are going to talk back to you, if you yell at someone they will yell back at you, if you help some one, they will help you back one day, if you give some one money, they will give that back to you one day, it is better to give than take from others, I would help anyone and everyone as much as I can, because one day all that will come back to you.
A blog is a very powerful tool, you can showcase your expertise, you can share ideas, you can test ideas, you can invite feedback on those ideas and over a period of time you will have something that you created, when you create something the feeling is special, I would work on creating something, create an app or create a website or create a product leveraging whatever skills you have and see what you can do with it. See if you can submit whatever you create to competitions, see if you can win, your time is better spent creating something cool and innovative rather than worrying about the credits.
Also the TIE (used to be called as The Indus Entrpreneurs) chapter has a program where they encourage, help and mentor young innovators like yourself, leverage those and create something great and cool, if you can sell it to some one that will be even more cooler. Your life is better spent that way.
Good luck.