Answer:
I understand your struggle. My advice would be to actively read a personal narrative and practice writing by imitating the style that you read.
Something like this can go a long way in helping you understand how to format a narrative.
To make a personal narrative interesting you have to act like it is a story, focus on the characters and the actions as well as their effects. Write it like a story, don't phrase it as boring non-fiction. Give this story a message, a purpose, and focus on that. Highlight the more interesting parts.
Expositions are tricky. There are a lot of choices you have as a writer. Which leads our minds to freeze a bit or default into a world of dullness. However, it doesn't have to be that way. First, you have to decide what you what to convey at the beginning. A set of characters, setting, the start of conflict, etc. Then, you need to pick how you are to convey this message. You can do that through dialogue, setting up an interesting place and time, building around a specific scenario, as well as stream of consciousness.
Looking up lists of transition phrases is a good start. Paying close attention to a personal narrative while reading can help you understand how to have these transitions more organically.
One of the main things is to always be aware of your resources. The internet offers all sorts of wonderful tools at your disposal to help teach you how to write. But in the end, the best way to learn how to write is to write (and read). Good luck and apologies if this was too long or didn't make sense.