Soulmate....Destiny

When i was a teenager i always heard or read the word soulmate in every person who is looking for somebody. I was kind of curious and confuse of what really soulmate means. Even if my friends explained it to me i cannot still understand what does it really means for a person so i just said it to myself that maybe when the right time comes.
Destiny...Its the word that i was really confuse..maybe? Does people make his own destiny? I heard so many definitions and everyone has its own beliefs,. We as human is already pre-destined of something to happen in our life.
Some people commit mistakes because of the path that they chose to take or the decision that they make. There are also people who just wait and let fate lead them.