The time you think you wasted is time in which you were learning many, many things. Yes, you could have been learning other things. So what? There is an old say

The time you think you wasted is time in which you were learning many, many things. Yes, you could have been learning other things. So what? There is an old saying: "You can't have everything.". A corollary of that is (when going to a show, or art gallery, or museum, or sports event) the simple fact that "You can't see everything, so enjoy what it is that you do see." A side effect of what you have learned is that it indicates to you what it is that you need to learn. I'd say that you are at that stage right now. Learning is a life-long experience. Life is not static. Once upon a time, a person would find a career and remain in that one career till he/she retired in their sixties. Today, many people will have two, three or more careers in their lifetimes. My four incipient careers were: pharmacist, computer programmer, commercial pilot, commercial landlord - completely different careers that depended on minor decisions to lead me down one path or another. I ended up doing two of the four long-term. The timing wasn't quite right to become employed as a computer programmer as my first wife didn't want to move several hundred miles, or as a commercial pilot due to a downturn in the early 90s General Aviation industry. I started off as a pharmacist, and later became a commercial landlord when my brother died and I was forced to take over the reins of the family business. At twenty-three you have so much ahead of you. Don't sweat the outcomes. Oh, and I will probably be downvoted greatly for this: Do not let "Duty" (also known as "Society's Expectations") control your life. You do not have to marry the good-looking girl. You do not have to have children. You do not have to have the big house. You do not have to have the prestigious job. You do not have to have the expensive house, or the expensive car. You do not have to be 'successful' by the age of 30/40/50/whatever. If those things happen in your life, that's well and good. But never feel you are obliged to do those things. We sometimes do those things because Society brain-washes us that we have to do all those by a certain age.That is wrong. Live your life according to what you want. Yes you will make mistakes. So what? Every life experience is what makes you, you.