Just keep your head up, look forward, and walk like you have somewhere to be. If you make eye contact that’s okay. When you get close up enough, just say hi or wave (whatever you are comfortable with) and keep it moving. Something that’s been helping me is remembering that people are so obsessed with themselves that even if I do something stupid or say something I think is stupid, I just shut that thought down with they won’t remember it tomorrow. We can get caught up on the small interaction and in reality people take in so much information throughout the day they likely won’t remember the small interactions. I also hate it when people say I’m quiet. I feel like I improved so much but people still want to label me as shy. I believe it is a form of bullying to point out someone is shy and quiet. It’s hurtful and you pointing out what society would say is a flaw.