Honestly, I understand your situation but you can't succeed as a founder from where you are today. That isn't to say you can't be successful in solving problem

Honestly, I understand your situation but you can't succeed as a founder from where you are today. That isn't to say you can't be successful in solving problems as an engineer (e.g. contribute to OSS etc), it is that you cannot build a successful business if you are not out talking to people and working on problems that people want to pay for a solution. Even if you somehow found an idea and created a great product, how are you going to sell it? You have to deal with and talk to people regularly to sell a product, even online products means you have to talk to people. My honest advice, your first project should be non technical and just be you. Join a local club, group, even an engineering focused one is fine, just something where you have to get out and talk to people so you can work on your communication skills. I am not suggesting you have to be an extrovert, plenty of successful founders and companies are ran by people that are more introverted. However, they have at some point learned enough coping skills to get out and in front of people and mingle to be successful.