You’re not ‘wrong’ to be scared. Many people, for the first time, finally put money into the market in 2008 right before the biggest crash days, in early 2020 right before Covid, and in 1987 right before Black Monday.
To spare yourself the agony, put only $5,000 in VOO and the rest in an online HYSA making 4.25%.
Wait a month, see how you feel, do it again.