First time social interactions

I have struggled with social interactions my entire life. The anxiety that comes with it pushing me to stay in my comfort zone, scared of being rejected. I am 24 now, and wanting to change for the better. I try so hard to socialize when I go out, but I am always too scared that I am saying the wrong things, or being awkward (which I very much am). I have always played this "Character", someone who is not me.

So my question is, what would be the best recommendation for first time interactions? how to do continue with small talk, when you don't know what to say?