I feel like this is a point that is often lost. It's why being an entrepreneur is such a huge risk.

You have to be stubborn enough to succeed in a world where the majority of people will tell you you're going to fail, you have to ignore all that.

Often times however, you do fail.

I think the opposite problem is also worth considering. No matter how bad the idea some people you trust will probably say go for it.

Good point, it's why it's such a difficult situation to be in. You really do have to block out everyone EXCEPT the customer that's actually using your product.

Yes, it is definitely a test of resourcefulness to persevere in the face of challenge, but you have to also know when you're doing the wrong thing or going down the right path. Persevering in the face of clear, direct evidence that what you are doing is not going to pan out is stubbornness. But persevering and LEARNING from what is working when other things are not is a best practice. The key is realizing when something is not working and then iterating to find the success. Or knowing that perhaps what you are doing will work, but the timing or market circumstances are not optimal, and then just biding your time until the market changes. This is not as obvious as one might think.

That is what great minds of business say about pivoting, especially in the early stage of business. Google didn't get into the ad selling business until they aquired AdSense. Now if I only can pivot some of my own ventures...

Life is difficult. Not just start ups.

Almost anything worth doing is difficult and to an extent risky. You are likely to fail both wasting time, money and other resources. But you are also likely to win big.

Anything that is easy is either already solved, or leads to mediocrity or pays too less.

To succeed at your goal you either need to get lucky or simply persist until you get there. Some can, many can't. Some just get lucky.