Find an autism support group
There are thousands of autism support groups around the country. These groups are for people with autism to get together and work through their struggles together. These groups are great for meeting people who experience some of the same things you do, which means talking with them about your condition will be much easier. This can be great practice for speaking about your condition with others. You also may be able to talk with others about how they told others about their condition. This might give you some great ideas on how to bring up the subject and navigate the conversation in general.