I want to feel more comfortable around people

There's a lot of layers there to your situation, and I'm focusing on two layers that may be contributing to your feelings of discomfort around others.  One layer is the daunting news that your son has autism.  Many parents can feel overwhelmed and distraught with this diagnosis.  The vast array of treatments available is daunting in and of itself at times to wrap one's head around.  Taking time to reflect or seek out therapy regarding how this diagnosis has impacted you may be helpful.  Some parents feel their individual identity gets lost in the diagnosis because they have dropped everything to help their child, and others may experience guilt.  If either of these or other feelings come to the forefront for you, it may be worth working through them with a therapist.  A support group list is available through www.autismspeaks.org and may help connect you with others raising children with autism.

A second layer is the abusive relationship you were involved in.  The trauma you experienced in this relationship may have a very meaningful impact on your ability to trust and to be intimate with others.  Engaging with a therapist can help facilitate the healing process, as well as paving the way for more comfortable and trusting relationships.