"What do you people think of me?"
What i think of 'you' , from my perspective, isnt the 'me' you refer to or see. No-one here can think about the 'me' you are talking about. We can only imagine 'you' or comment on how you appear to us, which depends on our own minds.
From your post, I admire your courage, honesty and sincerely wish you to be happy.
"Do I come across as one these; aloof, stupid, jerk, a creep or nonexistent. I need to know. People just don't seem to like me, whether in person or online."
Because this is what the 'me' you refer to is imagining 'everbody else' is thinking about you. They dont. This is how you appear to yourself, not others. So you think this is what they think of you. They dont.
What people think about you is not how you see yourself.
Everyone has likeable qualities, you have incredible qualities, they will become more apparent to you in time.
Do you realise how your post has helped so many people here? It has, greatly. No-one may directly thank you, but there will be others who find courage from what you have said, hope, a feeling of not being alone, that someone out there understands etc.
See your good qualities, others can, they may not tell you, but you silently give others strength.
Thanks
Jack