Do you think Severus would be different as a person if he never met Lily?

Yes. He would have been horrible. JKR has said as much.

Lily was his one saving grace, she brought out what was good in him. Without her, he would have been truly loyal to Voldemort.

No, then he'd be just another Death Eater, sad and alone...

Not much of a change. But still, he wouldn't be the good guy.

JKR said hat if he never met Lily the day that he did, then he would have been horrible and evil instead of what he is. But that wouldn't matter to me because i would love him anyhow whatever he was like because at the end of the day he's Severus Snape my fanticy boyfriend but Edward Cullen is my favourite 1 out of the 2.

Yes, End of Story.