[PopAlongKid]

In addition to saving and investing, I would address the "deal with" question by recommending you begin now a life-long habit of tracking your income and expenses along with the balance sheet of your assets and liabilities. Even if it is just a once-per-calendar-quarter update, try to capture your spending in various basic classes (food, transportation, shelter, entertainment, clothing, health care etc). You can also track your ordinary (operating) income separately from your investing income, since the investing income will be much more volatile but also you have many more years to recover from shortfalls.

Your spending may be very simple and limited now, but moving out, getting married, having dependents, becoming a homeowner and so on will vastly complicate it. It's useful and comforting to have some history on file to see if you are going "in the right direction", whatever that is for you.

There are any number of software programs out there, both commercial and free, to help, whether gnucash, Quickbooks, YNAB, or others that have been discussed on HN over time.