We fail because we can't always succeed. because we have to give ourselves time to grow and improve ourselves. Growing and learning never stops.

I've failed in my studies because i was so stressed. I came to a point where i was discouraged by everything. What was the point of studying so hard? What was the point of going to school? I felt that i had a no life some years ago. All i did was going to school, after school i had to go to private tuitions till 8pm, do my homework till 1am, get up at 6am and the same thing everyday. I even had to go to tuitions on weekends. Like honestly, i didn't have a life. Now that i've grown up, i got to understand that it's all about balance. Being determined is a good thing, but putting too much stress on oneself is bad. I'm still stressed and it's my "insecurity". I'm a real perfectionist when it comes to school and studies. I used to make myself sick because of school stuffs. I'm stressed about what's gonna happen to me if i don't succeed in life, if one day i don't reach my goals. But if you work for your goals, you'll be rewarded.

I honestly can't deal with my stress. But most of the time, i find an escape. Music, dipdive, games, tv...These are my escapes. or even going out, walking in the neighbourhood, just taking the time to breathe and appreciate what has been given to us. Things that are usually taken for granted but that ultimately are part of our lives.

I totally agree with you: Many people fail because of their insecurities. If we try to achieve something with a passion that we really love then we are more afraid of failing than if we tried something that doesn't mean so much to us. Those passions that each and everyone of us have arose from our hearts, from deep within, and we couldn't bare to fail with them cause they mean so much to us.
You asked what our insecurities were and I gotta say, my biggest one is the insecurity about my future. Everyone else seems to cope with that issue so much better than me, and this makes me insecure - although I know that I have some very good plans. I learnt to focus on myself and my own plans and dreams. It doesn't matter how big and great the plans of all the other people sound, all that matters is that YOU move forward on your path of happiness.
You just have to realize that life isn't about finding yourself, it's about creating yourself! So, take every opportunity and take every risk, cause your personality is made out of all your experiences :)