As someone who has alot of close and extended family who are Sikhs(I personally am not) as well as many close friends yes there are examples of discrimination against Sikhs in this country. I personally spent a fair amount of my earlier life in the South and much of my extended and close family who are Sikhs also were in the South.There certainly were instances where life was harder for them than for many other ethnic and racial groups. There were many instances where there was discrimination against them in their lives. We don't need to pretend like problems surrounding racism still aren't a serious problem in this country. The struggles Sikhs face is very much a part of it.
Having said all this, I know many extremely successful Sikhs in this country. I know many who have large social groups and numbers of friends. I know many who have integrated extremely well in this country and have been able to overcome the challenges they face very well. If you don't let the instances where you might face discrimination define you, they won't.
You have a unique background and experiences in your everyday life. Medical schools value diversity. Diversity isn't about skin color(as much as we make it) as much as it is about perspective and the unique/different things that define us and our experiences. You have plenty of valuable experiences in your life and can offer a perspective many others in a class can't. This isn't to say the standards for admission will be lower for you. You won't be treated like a URM. But you have plenty that you can discuss in interviews and essays about your background and life story. There is plenty someone like you can add to a class and that is the central question you'll always see
LizzyM and others ask and talk about. You can add a perspective many in med school can't and have a different understanding of being a minority and facing discrimination and what it entails, particularly if you have ECs dealing with things like this. These are all things you can bring up and highlight to med schools and how your activities of your life highlight this. Do this effectively and highlight what exactly it is that you can add that is unique to a class, and it will certainly be to your benefit.