Has anybody told you that your eyes go buggy or that your face tenses up too much? It sounds like you are being very self critical and I wonder - if you have in fact been putting people off in your interactions - if this is due to the physical quirks you've described or if people are just put off by the nervous energy you're sending out when you are telling yourself that you're doing these things.
A bad habit that I actually still struggle with to this day is that I am always trying to "guess" what I look like in a third-person view. That is, if I am talking to someone, my brain will start going, "Are your eyes doing the right thing? is your face doing the right thing? Do you appear relaxed enough? Is this person comfortable talking with me?" And the ironic thing with that is that my eyes, face, body, conversation etc. are probably all fine, but I am now so lost in my head that I am not making the other person feel comfortable. If I notice the other person isn't enjoying their interaction with me, that validates my self-critic - oh, she walked away because your eyes went too big - when, in reality, it was my self-critic that was the problem.
Well, don't do this. That's how you become a real creep and get yourself arrested for indecent exposure. Leave the trench coat at home, man. Haha.