How do I tell my mom that I was molested and what will happen when I do?

I was molested by my older cousin and my aunts husband (separate times) i was just a Little kid when it happened so it didn't really affect me before cause I didn't really know what was happening to me, but as I'm getting older I'm sad all the time, I always have this horrible feeling in my stomach and I'm always depressed. I want to tell my mom what happened, but every time I try I get that horrible felling in my stomach and I just runaway from it what do I do?