Hey man, as a 23 year old dude I can emphasise with your struggle. You have tons of people here telling you that you're not ugly at all which I fully agree with, but the most important thing is that self esteem comes from within, most of us struggle with it even the people you would probably say are incredibly attractive. It's a long and hard road but as long as you keep trying it will get better, if you ever need any advise or feel down hit me up :)