Loneliness is becoming too much to handle..?

Lately, life has been working out for me pretty well and I know I could work harder to succeed but I just can't bring myself to work hard at anything or care about much anymore because of how lonely I feel. It's devastating, to say the least. I know everyone feels lonely at one point or another but this is the first time in my life where I have truly felt alone. I mean, I have maybe 2-3 friends who truly care for me and I sometimes question them because they never seem to want to talk or hang out. I am currently single and have extremely low self esteem.... So low that it would be a shock if I got into a relationship. My teeth are my biggest problem and I need to get fillings and 5 root canals, if all that goes well then it might help my self esteem but until then, I will continue hating the outside due to my facial complexion and teeth. I go outside a lot with people but I don't think they are friends, they kill time though and every time I am out I become paranoid that everyone is talking about how bad I look or something and it's become such a big deal that I am starting to naturally hate people. Random people who have done nothing to me I will scowl and yell at for being assholes. I hate being so lonely that if I am away from anyone for more than five minutes I want to break down. Do not judge me because I am lonely. I hate that my self esteem is so low that I am convinced I will never find love or even a relationship. So low that I pretty much despise the world now. I used to be very happy and loved myself. I don't know what exactly happened but it did and now loneliness along with my self esteem are taking over my life and I can't bring myself to care about anything anymore. I purposely missed 3 job interviews and delayed going to college for another semester. I wish I had enough confidence in myself to believe I was good at something.. But I know I am not. I love to write and take photos so much that I am addicted but I suck at both and so I don't have the drive to do it anymore... I think my only skill is being able to help others and I haven't even been able to do that cause of how much I hate myself and others. Helping others takes so much out of me though because I constantly feel used and walked on... It doesn't help that my girlfriend of 3 years left me. Ugh... Anyone have anything? I mean, alcohol seems like an excellent option to me. Please don't tell me that time will heal me. I know that it is true but time is what I don't have for the pain is becoming too much to handle.