Remote work

I am 28 years old, living out of a backpack in Thailand, and working remotely as a freelance video editor making $70,000 a year. I want to start a retirement fund with $15,000 I have sitting in a digital wallet, but I do not have a permanent physical address in the United States anymore. If I set up an online investing account using my brother’s apartment address back home, am I going to get in trouble with the IRS when I start withdrawing it thirty years from now?