sibling testing

Hi my name is ashley im 21 years old last year my aunts husband past away she has two sons there father was a lovely man as i had no dad he called me princess the day he died my mum dropped a big bomb shell on me that he was my father iv'e been getting abuse off his side of the family telling me mum is sick in the head for saying this i can't afford a Sibling DNA test for me to take with one of his sons i really need any help as im going out of my mind with questions and i really need answers iv asked my mum billions of times why tell me when he died and not when he was alive they both had a pact that if one died the other would tell me its horrible i feel like im inbread hurts so much cause the man i knew as my aunts husband could be my dad and my cousins could be my half  brothers their was so many things i could of done when he was alive but i never knew it breaks my heart that my dad and mum kept this from me i wouldnt wish it on anyone so please help me raise this money to stop all horrible messages im getting off his side of the family and to put my mind at ease thank you so much every cent counts and god bless you i hope there is hope for me  Ashley x