OCD or my true feelings?

For the past few years i have been feeling uncomfortable around my uncle by marriage. The thing is, that i know he feels some kind of attraction towards me. I am certain he would never hurt me or do something physically to me. But even the thought that he "likes" me is making me very anxious. The anxiety is so bad, that i even get panic attacks.I have terrible feeling of guilt for thinking that he is attracted to me, even though it is true. He was always like a father to me, and there has always been chemistry between us, he was like my idol. And now i am obsessing with thoughts like, what if i like him more than my uncle, what if i have feelings for him. And this is making me very anxious, ashamed and guilty. Everytime i am around him, i am analyzing my behaviour and feelings towards him. Everything came so far, that i really don't know, what my true feelings are. I have even convinced myself, that i am in love with him. The feelings and thoughts feels so real. A have been obsessing with this for 2 years now. Everyday is the same-only anxiety and guilt. Because of guilt i don't let myself to be happy. Life is a torcher for me. The "cause" of my guilt is his daughter(my cousin), who has been my best friend since for ever. And for last 2 years i have been avoiding her, because i can't stand being around her with this feelings and thoughts. Around her the guilt increases. The worst thing for me is, when she says something nice about me or that she loves me. I feel guilt, guilt and more guilt. I am not used to keep secrets from her. I feel like my life is over. It is hard for me, because i don't know if this is OCD or not. What do you think?

This sounds very, very much like Pure-O OCD. I'm convinced that's what's going on here.
I think you need to realize that. You can love someone without being sexually in love with them. That may be what's going on here and I don't think that's something you need to suppress, nor would it be good for you to do so.

Thank you for responding.

Years ago i had some intrusive thoughts, that i will hurt myself or someone from my family. Even though it made me feel very anxious and scared, i was aware that they were just thoughts and that i wouldn't hurt no one. This time it is different, because i really doubt this is OCD. It feels to real:(.