See title. Since I started lifting I got a different (better) posture. Also, I tend to look people straight in the eye when I talk or listen to them. But now I am wondering if I have become scary or intimidating. A short synopsis of the two:

Girl 1: Knew this girl for a while, hung out with her a couple of hours at a bar when going out since we both didn't feel like clubbing that night with the rest of the group. We had good laughs and she actually talked about how she hated the fact that we are always so mean to each other. At some point of the evening we sit together on the bench, look her in the eye, and says dead serious she is scared of me. When I asked her why she said "No, not that kind of scary... it is hard to define." I just changed the subject after that. Note that while she said that she kept sitting next to me.

Girl 2: Decided to walk downtown in the going-out area when I meet a girl I have known for a while. Did the teasing like I normally do after she said she couldn't come with us even if she wanted to: "Ah so you are with your boyfriend?" "No, my best friend. I do not have a boyfriend :(!" "A beautiful girl like you, you must be lying!" After that she slapped me softly on my shoulder saying something like "Don't say that! I am not beautiful." which resulted in my tickling her belly. She was laughing real hard and then when we cooled down she said she was intimidated by me for some reason. Note that while she said that she kept standing next to me and when I left INSISTED I gave her a kiss on her cheek.

Are these just some stupid shit-tests or should I actually be worried? Also, in the future, how should I handle these kind of situations?