You've created problems that don't exist. They're concerns that most people don't have.
You don't know what to say. That's fine.
You might be wasting their time. That's fine.
You might not know how to end the conversation. That's fine.
It's ok to be awkward. It's ok to be honest. It's ok to bother people as long as you take their feedback appropriately. It's ok to walk away without saying anything.
The more often that you talk to people and actively reflect on the REAL outcomes of it, the sooner you'll realize those concerns aren't shared by most other people.