Frequently losing on time

I'm fairly new to chess, but a problem I'm facing is that a very large number of my losses on 10-minute matches are because of me running out of time. I tried to mitigate this by playing 15|10, where it only happens very rarely (Yet I still take at least double the time of my opponent), but I still feel I should learn how to play 10-mins, since it appears to be one of the most played modes.

Just to name a few examples: In my last 10-minute win I had 53 seconds left, while my adversary had 6 minutes, and in my last loss, where I lost on time, my adversary still had 3:47.
How can I improve on that?

Hello @Sky_Sumisu This is actually a really common problem when starting out and just because your opponents can move faster, this doesn't mean they shouldn't be taking more time too. 

Your observation is correct that 10 min chess is the most popular time control on chess.com, but if you want to improve at chess long-term, it is usually recommended to play longer time controls to give yourself enough thinking time so you don't feel rushed. Different people naturally move at different paces. If someone feels okay at 10 min time control, then maybe 15/10 is a little more comfortable to give them more thinking time. Similarly, I have a chess.com friend of mine who used to mainly play 30 min chess and they claim one of the best things they've ever done for their chess was switch to playing 60 min time control games instead. That is 60 min per side though and most players don't have 2 hours of free time to spend on a single game. What you have to do is find what time control(s) give a good balance for you.

Playing faster and more accurately under those speeds becomes a lot easier with pattern recognition, practice and experience. 

If you want to improve at chess overall, improving at longer time controls first and then slowly playing with less and less time as you gain experience is preferred. If you see the top chess players in the world at long time controls, you'll notice that those players are also the best in the world at speed chess too. However, people only good at speed chess and not longer games usually just become chess hustlers in the park or play chess online for fun. There is no right or wrong if they enjoy it, but if you want long-term improvement, you usually want quality over quantity and not feeling rushed in your games, so you have time to consider your options, think before you move, scan for blunder checks before you move and so on. 

Best of luck on your chess journey and feel free to message me if you have any questions

OP I have the reverse issue.  I play 10 minute time controls and I move too fast.  I realize a longer time control would give me more time to think but when I've tried it, I did even worse than I do at 10 minutes.  I realize 10 minutes isn't doing much for me but I can't bring myself to switch given my poor play seems to turn worse with longer games.  It's a conundrum. 🙁

15|10 is the better time control.

I’ve always had an issue with getting flagged when I migrated from classical OTB to online chess; I still do to this day and often find myself time scrambling in the end game on time increment.

What I did to improve pace was improving my tactics and familiarity with middle game plans/strategies.

Truth is, 15/10 is a FIDE official rapid time control so you should stick with it to accurately monitor your progress However, if you can find longer games, definitely do that for improvement.

10/0 is blitz OTB under many federations so you may as well play 5/5 blitz when you want to have fun and more games in your playing sessions.

There's only one way: think faster.
Often it means you get both body and mind into a higher gear - eat better, sleep more efficiently, more off-screen time, healthy work-life balance, exercise at the top of your ability to get out of the comfort zone, etc.

This doesn't mean you are actually worse with longer time controls, it just means that your opponents get better results than you with those longer time controls. Why? Experience and practice of course! If you were to play more at those longer time controls too, then you'll also feel more comfortable with them and play better. In a longer game you might have more free time to think, but don't forget your opponent does too, so longer times don't make chess "easier" - it just gives both sides more time to hopefully find better quality moves.

The real gem about longer time controls isn't the time itself. Paradox, right? Let me explain. A 30 min game gets you no better quality if you finish the entire game in less than 10 minutes, that might as well be a 10 minute game. The "real" benefit is having the extra time so that you can evaluate each move a little deeper and a little better. If the extra time does nothing for you, then all it probably means is that you don't know what to look for or what to consider with more thinking time.

You can calculate your lines a little deeper, blunder check a little more carefully, try to anticipate the opponent move if you were to move somewhere (ideally before you play it). There are many ways one could utilize that time mid-game. The hope is to give your moves more thought and reason and then analyze the game afterwards to see how your thoughts align with the computer (or theory or databases or whatever else you are comparing to) and then rinse and repeat the learning process.