Any fear that your friends and family have is probably based on their lack of knowledge. This could be corrected if they were able to learn the same cool strategies that you learn by reading books, courses, tapes, online, etc...
The problem with this is that most of your family members probably aren't interested in Real Estate investing. There's nothing wrong with this, not everybody enjoys sports, music, etc.. So if your family members aren't interested in Real Estate investing, they won't learn enough to understand what you're doing so they won't be afraid of what you're doing.
The best thing for you to do is to keep your investing progress to yourself most of the time. Only tell them when you actually make money on a deal. You're probably boring them with details they aren't interested in anyway.
Another thing to look at is how successful your family members are in this area. It doesn't matter how much you love and respect them, if they aren't successful investors you shouldn't be taking investment advice from them. This is the same as taking diet advice from someone 200 pounds overweight, it just doesn't make sense.
It can be uncomfortable for people to see you succeed because it forces them to deal with their own inadequacies and failures.
My best advice is not to share info about your investing with family members that are over protective or critical. Just love them for other reasons.
Jeff