As someone who was very socially awkward well into my early twenties--I feel your pain. There are a lot of aspects to doing better socially, but the most important one is just to keep putting yourself in social situations as much as possible. Even little things like practicing eye contact and smiling with strangers is helpful. Set small goals for yourself and work towards them. Allow yourself to make mistakes and look stupid sometimes. It happens to everyone. A lot of people are awkward socially because they are so afraid of looking dumb that they hardly talk at all. Whenever you make a mistake, don't beat yourself up. Instead, just think about what you'll do differently next time and try again. I listed a really helpful website below with lots of articles that should help you with what you need to know.

You can meet new people by online dating, cooking classes, etc. Basically, to keep the conversation going, you can ask them about themselves, talk about hobbies, etc.