Should I keep this a secret?

Well I have kept alot of secrets suppressed as a child but they are now emerging and I'm realizing that in order to move on with my life I need to just put them out there so I can get over them. One of my most suppressed memories from my childhood and is coming up the most happens to be the fact that when I was around 5 years old my brother older brother (who at the time was well in his 20's) did in fact molested me and on numerous occasions tried to rape me. This was also a person that would torture me by dragging me from my bed in the middle of the night and holding my head in a oven set on broil. Who also held me up against the wall when I was a infant by my neck strangling me until I blacked out. I know it all sounds so dark but its been 18 years and this is all in the past; so is it really necessary to talk about? Should I really cause so much heat and damage to my already cracked family? And besides I really doubt anyone would really believe me its been so long I don't really think anyone would really care. But my question is should I really say anything about all of this?