There are many different situations for this to happen. is this for vocabulary words? if so may I see them?
A. Landon must decide whether to go on a senior trip now that his best friend cant go.
An internal conflict is a decision that must be made. The decision is usually difficult because there are pros and cons to either side. Even though Jennifer not being able to find the eggs seems like it's only Jennifer's problem, it's not an internal conflict. It is not only taking place within her head. She's actually in a battle with the eggs who are "hiding". Bobi's conflict with the video game console is also external because it's not within her. The cat fighting the dog is a clear cut case of external conflict as it is two different things battling it out.
I'm not going to write the letter for your 45 year-old self obviously but start by saying "How has the journey been so far". Consider all the factors like having your children being the age you are now. At 45 you may be a lot more smart, definitely more wealthy. Wish yourself luck no matter how blank the future may be, etc.
Historians I believe would be most entertained with this information