The sweetest experience in my life

There   are  many experiences in my life.  They have come and gone freely;

 but i want to tell you one experience which  has left a  trace on my heart.
When I was a child, I loved Sunday so much.   I would wake  up early in the morning and take a bath. My father would  comb my hair and then we would  go to church  on foot  together. We walked arm in arm. I sat beside my father and followed the mass. I always loved that moment so much.

  Very nice memory Monika, and well thought out.

The Sweetest Experience In My Life

There's have been many experiences in my life. Come and out freely. (I don't understand what you mean.) But I want to tell you one experience which has left a trace on my heart.

When I was a child, I used to love Sundays so much. I would wake up early in the morning, and take a bath. My father would comb my hair and then we would go to church together by on foot. We always walked arm in arm. I always sat beside my father and followed the mass. I have always loved those moments so much.

#please correct my writing... thanks a lot...

Good effort. Try to practise Present Perfect, as well as the grammar for past habits (used to, would).