How to use a token through out an API

I am having trouble with what I believe is asynchronous functions. I have some end points pointing towards a host with some requests to get a token from my login data, and another get request that uses that token to retrieve information about my profile.

The issue I believe I am having is that the login get request runs before my token is actually saved to my header variable. Is someone able to explain a way that I can wait for the token to be received before my API sends any other requests out?

const fastify = require('fastify')({ logger: true });
const axios = require('axios');
const fs = require('fs');
require('dotenv').config();

const username = process.env.USERNAME
const password = process.env.PASSWORD
let token
const instance = axios.create({
    baseURL: process.env.URL,
    headers : {
        'Authorization': `Bearer ${token}`
    }
})


async function login() {
    const response = await instance.post('/login', {username, password})
    token = response.data['token'];
    console.log(token);
}

async function me() {
    const response = await instance.get('/me')
    console.log(response.data);
}

login().then(me())

@noassl was correct with their comment. The real issue I was running into was with my incorrect assignment of the token. I changed the code to modify the instance properly.

const fastify = require('fastify')({ logger: true });
const axios = require('axios');
const fs = require('fs');
require('dotenv').config();

const username = process.env.USERNAME
const password = process.env.PASSWORD
let token: string
let instance: AxiosInstance = axios.create({
    baseURL: process.env.URL
})

async function login() {
    const response = await axios.post(`${process.env.URL}/login`, {username, password})
    token = response.data['token'];
    instance.defaults.headers.common['Authorization'] = `Bearer ${token}`;
    console.log(token);
}

async function me() {
    const response = await instance.get('/me')
    console.log(response.data);
}

login().then(me())