How to overcome anxiety surrounding certain situations and social anxiety?

I am so glad you were vulnerable enough to reach out to us for guidance by asking your question. It sounds like you have a lot of good insight on your anxiety and social anxiety. It would be really helpful to connect to a therapist to start exploring more into your anxiety. A lot of times when you're dealing with social anxiety you're also dealing with some perfectionism and people pleasing which usually stems from somewhere in your childhood. This is an area worth exploring to see what inner critic messages are going on in your mind to make you feel the way you're feeling.

With general anxiety, It is important to look at what you can control is situation like this. There are so many things that are simply out of our control and those tend to be what we stress and worry about the most. I suggest making a list of things that are in your control and those that are out of control and see what is affecting your anxiety the most. If they are things that are in your control then set some small goals to work towards those areas. What you will see is it is not in your control as far as what others think of you. I love the quote by Dr. Seuss, Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind. 

Mindfulness skills are helpful for stress and anxiety but can also help you with thought distractions. Deep breathing is one great skill that can help you when you're feeling anxious or have a self defeating thoughts. When we become anxious, our brain sends a signal to your brain that you are not safe so your breathing is affected and you start to take shallow breaths. Taking deep breaths in and then slowly out can send a signal back to your brain to calm down. Place your hand on your stomach and inhale for five seconds, hold in for 5 seconds and then release the breath for five seconds and do that several times. You can also try some grounding activities in which you notice five things around you, four things that you hear, 3 things you smell, 2 things you can feel and 1 thing you can taste. This also helps bring you back to a regulated balance state. 

Again, I am so glad you reached out for guidance. I wish you the best of luck on your journey.