There are so many accounts of people experiencing past lives that I don't doubt it's real. I don't know if we reincarnate 1 to 1 to become someone else, or are capable of sensing 'vibes' from other people's lives in the past, but some cases are so detailed and full of verifiable facts that it's evident there's something to it. You can search for James Matlock who is currently studying these phenomena - and maybe even contact him with your case. You could try to find who was this young man you feel connected to. When did he live? Do you have a name, or any other facts to actually identify him? If some family of this person are still alive maybe he has some unfinished business, or a message he would like to pass to them.
Write down what you experience, and don't write it off. This stuff is very real and if you happen to be aware of it there's probably something that needs resolving.