You should be aware of the fact that talking about money can be uncomfortable for some people. You don’t want to offend anyone that is making other decisions than you are.
Share some suggestions with your friends when they are for example not sure what do to on the weekend, or how to save some money.
You can help them by actually offering advice, by replacing the fancy dinners every week with home cooked meals, or by recommending a book to them.
Being honest with yourself and others really show where you are in terms of finances. You don’t need to know everything.
Even if you do, don’t make any assumptions about others and their financial decisions. There is always a story behind it.
Talking with friends about money should be about lifting each other up.
Often jealousy is coming from comparing yourself to others. It is holding you back, whether you want it to or not.