Small talk is difficult, it feels awkward. I used to have massive problems with it. But I stress this, you will get there. It's as simple as asking questions. You need to learn the difference between being overly probing and showing an interest. For example, ask what a colleague did over the weekend. They tell you they went to the local zoo, you say wow amazing did you see any red pandas I love red pandas.

Admittedly, small talk is only part of the problem. There are other aspects such as eye contact, tone of speech and so on. Read a book like 'The Charisma Myth'. Practice on 'peripheral' strangers, those who you encounter regularly but are not close to. You'll be anxious, you'll feel awkward but I promise you that you will get better. Quite often now it's natural to me, but I can always fall back on learned patterns when I'm feeling awkward. People now tell me I'm very easy to speak to. 6 years ago I would have been described as awkward.

I recently was diagnosed with ADHD, primarily in attentive. Honestly, this explains my 'naturally' poor social skills. But I learned anyway. You can too!