Deeply saddened by the fact things won't work out for me.

I am 17, never kissed a girl, never really had a close girl that was friend except Once in middle school. We don't talk anymore. I feel so empty and i just feel like I will never have a relationship. I will never be able to say I love you to a girl, or cuddle with her, or have sex. I've tried to improve myself by losing 75lbs to gain confidence but it hasn't done what I wanted it to. I see how happy others are and i am so jealous of them. I feel like I'm messed up. Somewhere whether it be in the head or maybe I'm just too unattractive. Maybe I'm too nice, I find it difficult to be mean. I just feel bad on the inside. I guess since I'm not a douchebag there's no hope for me. I'm almost done with high school and I feel like I missed my chance. Everyone learned how to date and I'm just stuck now. I don't know what to do, I just feel like something is missing. In terrified of being alone my whole life without anyone. I almost breakdown thinking about it. I've heard everything from "there's someone out there" to "keep looking" it never used to bother me this much but now I'm feeling hopeless. I don't know what I expect anyone to say, I just felt like venting instead crying again. Thanks for anyone who actually read this and responded.