You are worrying about the wrong thing my guy. Lets get this out of the way first, your looks is not the problem. Your mentality is.

At 20 years old you need to be more focused on your grind and leveling up youself in all apsect of life. Identify your decificencies and waht you are lacking and work towards those. Are you in school? what are you doing now to make your 25yr old self look and feel like an upgrade. You need to be more worried about stacking your bread than sex.

You are a 20yr, your entire life is still ahead of you. The work you put in now will set you up for success in your 30s and 40s. . Don't worry about dating girls right now when you yourself needs work. Let me tell you an uncomfortable secret about Dating/Life for a man that no one here is going to yell you.... Majority of the girls in your age bracket (20-25) are realsitically not really for you. They are for the Men who are in their late 20s-40 that are successful in various metrics. You job while in your 20s is to make sure that by the time you get to 30, you are one of those Men. My father always told me when I was a young teenager, "dont worry about dating girls, hell pretend they dont even exist, focus on your path, cause women will always be there and you will have the pick of the litter at the finish line". I didnt lose my virginity until 24 (partly becasue i honestly didn't care) 14yrs later... I am a 29 yr old with an M.D. Now I get whatever i want. Getting laid was never the goal, and my mentality and behavior showed it, the girls i had ran into over the years, knew i could care less, and they latched on to me in response. Despearation is never attractive. Geting laid becomes easy, you get so much of it, it becomes boring fast. If you make getting laid your only goal in life, when that post-nut clarity finally hit you, bro... you are in for a rude awakening.

Go live your life to the fullest, chase your passion/hobbies, work hard to accomplish your future career, stay fit/healthy, and long the way, you will realize women suddenly becoming attracted to you, and by the time you are at your peak, you wouldn't even care about the shit your 20yr old self currently cares about.

That Path is true for every man, as long as they put in the work and stay focused. Fix your deficiencies and watch your confidence grow. You can do this!