First and foremost, since you admitted you have as of recent been a chronic liar, I have to question whether there is anything untruthful in your post.

Even though ASPD stands for, "anti-social", it doesn't mean that those with it are necessarily introverted and avoid people as much as possible. Instead, it refers to going against the norms and morals instilled by members of society. Many people with it are or seem to be friendly, sociable and outgoing. The reason I include, "seem to be" is because there often are ulterior motives for such social acts. For example, you may like a friend because they share similar interests in music, whereas someone with ASPD may socialize with them for that reason, or because their parents easily give lots of money to them and easy to manipulate.

Additionally, like all personality disorders, ASPD is seen around early childhood to early teen years and doesn't change easily. From what you described, everything changed when you were 26 years old. I cant tell you why you have this sudden onset because there are many factors to consider and all I know about you is this blurp, whereas you've known yourself for 26+ years.

It's clear you're intentionally avoiding others, feel bummed out, think of killing yourself very often, so to me, that all spells depression. I cant tell you why, maybe you were in a relationship that went tits up and you got burnt by it quite badly and are reflecting the traits the partner displayed. Maybe you've experienced a loss of friendship from others and to prevent further hurt you avoid any sort of personal commitments. Maybe you've had a change in how you view society. Maybe you experienced a loss, whether it be personal, financial, and the list of possibilities goes on. I'm quite certain though it's not ASPD.