I don't confide in my best friend.

Background info: 11th grade, girl

I feel like when I talk to my best friend about something, I can never trust her response, so lately I just haven't kept her too up to date. Like last month, I told her about this guy I had a thing with, and I was really happy about it, and she just came back with, "I'm sorry but I don't think he really likes you," when I was positive that he did. Then I started doubting it and it screwed everything up. Now, in order to keep her from persuading me more that the guy doesn't like me and possibly making me doubt myself again, I told her I was over him. And now I feel bad because I'm basically lying to her. She's never had a successful relationship though, so I have a gut feeling she's just trying to put me down because she's jealous or maybe she's scared of losing me to him (like one of her old friends). I feel like she's giving responses that are centered around not my best interest, but her own. But I can't really blame her. How can someone else really care about my outcome as much as I do? It's my life, and I don't care what you think, I'm the one who it's always going to matter the most to. Since other people will always put their own happiness above mine, why should I trust them to influence me, when they're obviously going to put their own needs above mine?