Please tell me, what should I do if I always feel like an outsider when doing things?

First of all, the first is that your own attitude and emotions are not positive and proactive enough. You are not well coordinated. Try to give more opinions and your own ideas when dealing with friends. Be active and interested. Also, be confident. Don’t always think that others are right. You must also build up confidence. Don’t think too much about other people’s ideas. Be bold and put forward your own ideas. It will be better this way