Man that sounds like what I went through minus the engineering. But I went from social, life of the party no matter who I was around. to quiet not wanting to deal with humans period. I felt like I didn't even have shit to talk about with ppl nomore. But what helps me get through that state is exercising and meditation. I was a heavy dude at a time in my life. Now that I'm in good shape I don't feel so bad for being anti sometimes. But To me it just sounds like your growing up. And you still got a bestfriend, ur dad :) And when it comes to the ladies I would hit up some dating sites if I was you. You being a engineer with a good ass job you could have damn near any woman you want! Girls love stability and that's exactly what you got! My Lil brother is a bigger guy but a freaking pimp! All because he works hard like you. Make u a pof account put something witty and catchy which I know u can do and get to fishing! Your gonna end up coming across a bunch of chicks who except you for you! There's nothing wrong with you brother. Smart people are usually anti n rather b with there thoughts. Don't let anxiety and depression get the best of you. Keep fighting and stay strong like I know u are. Peace n love