I'm also not good at making friends and I've never felt friendly. I'm shy and always the befriended instead of initiator. So, much respect to you for trying.

I have trouble showing emotion and expression through my face. I stumbled on something that helped a little with that- facial yoga, lol. Once I started 'exercising' my face, stretching my face into all kinds of ridiculous expressions (when I was alone), expressions started to come a bit easier without me having to force them. It is now easier for me to smile. I think before when my face would start to crack into a smile it felt stiff & unusual so I unconsciously tried to correct back to my blank face. I've noticed people are more receptive to me now because I don't give off as much as a withdrawn & afraid vibe.