I experience this even around people I know and and friends with. I find it easier to talk when there is less of a crowd. I’m better just one on one or in a small group. If you get out fairly often maybe try becoming a regular at a local coffee shop, if you swing by every morning and see the same barista they may start the conversation and as the weeks progress you’ll become more familiar with him/her. Small successes will give you a little confidence with will lead to more success and a little bit more confidence. Also keep in mind that it is ok to be shy, I am coming up on 37 and I’m still a shy individual.