What is the point of existence?

My humble greetings to you sir

I have lately been feeling miserable as i have failed to make any decent headway in the path of Brahmacharya, every time the semen leaves after i foolishly masturbate hell is manifested in every way possible into my life. So now my motivation is nigh non-existent, and i struggle with the most mundane of tasks. ( I have been trying seriously now for roughly a year at Brahmacharya, i cant seem to go much longer than a week, which is humiliating and deeply embarrassing for me to admit.)

I have tried to apply the lifestyle and practices you have mentioned in past answers, but i live in a very busy, crowded and noisy place, which means that it is almost impossible to mediate or practice the aforementioned lifestyle changes.

How can i remedy this?

Coming to my main question, what is the point of life/existence?

I am approaching this from a non-religious perspective, sir, you see I was raised as a Christian, but do not really follow it any more.

My path to Spirituality and subsequently Brahmacharya began when i had a realisation, I realised that God was all and i had a deep love for the Father (I personally refer to God as the 'Father') and then had a deep longing to be one with Him, and abandon all the false worldly distractions.   

Sadly this has faded over the roughly 1 year since i began or had the experience of desiring to dedicate my life wholly to God.
Now i am wondering what the point of this illusion is and how to get back to the blissful state.

Please, sir, can you offer advice and help to me so that i can get back to the correct path?

Thank you very much, i offer my humble gratitude.