Ultimately, the success is based on the strength of the execution and finding product market fit with a big enough market. If you're too burnt out, it sounds like you are hitting some internal limit.

If you have hope (and resources) push through. If you don't, step away, recover and reflect.

If you find yourself passionate about it later on, then you can go right back in!

Being able to construct a story of growth, entrepreneurship and risk is a great one to tell in your 20s and you shouldn't be ashamed.

In the end you have to want it. The “it” is not any kind of real success, but rather just doing the work, those thousands of tiny accomplishments that nobody else sees. The work spent toiling away making continuous progress on things you aren’t comfortable with, like sales or finances. It’s hard to claim victory over those things when building the product takes all your time and money. That balance are those many tiny things you have to claim victory over. It never gets easier, but it does get more reassuring as your support system grows.

> I isolated myself from friends and family

I promise your friends and family are more let down by you abandoning them then they would be of your startup failing. Most startups fail!

There are a lot of inspirational startup stories where founders only saw failure and misery ahead, pushed through anyway with great personal sacrifice, and then managed to succeed against all odds. But there's a hundred times as many stories of founders who tried the same thing and just lost it all with nothing to show for it (we don't tell those stories as often). Don't lose your health and loved ones in pursuit of an unlikely business venture. You're young and you can always try again later with this experience under your belt.