Well first I would like to congratulate you on being able to quite smoking. That's not an easy thing to do… you should be very proud of yourself.
As with forming relationships it is obviously also not an easy thing… One of the first things you have to do is be willing to commit to the time and effort it takes to build a relationship. And if your up to that challenge… then I don't see why you can't have good relationships with others.
Here are some little tips that might help you get there:
-smile & eye contact
-open body language
-use the person's name
-don't underestimate the power of doing little things for people
-listen
-ask them questions about themselves
-be caring and kind
-be positive
-and last but not least make them feel very special
These are only some of the things you can do for others… And although it's a lot to take in, I'm sure you can do it.

Best of luck to you Althuzia.