What are some good excuse to start talking to someone?

Answer 1

You can say that you are confused about something in school (if you are still in school).

Answer 2

1. Asking for their opinion on a common interest.
2. Complimenting or commenting on something you notice about them.
3. Asking for help or advice on something they may be knowledgeable about.
4. Introducing yourself and mentioning a mutual acquaintance or event.