Does life get better when you are older?

I am starting to think life is just unfair and I starting to lose faith in humanity. I always treat others well with respect always helpful try to be considerate and do no wrong but I always seem to notice all the "bad guys" in life seem to win and have it good.Like my ex girl friend who I absolutely loved and cared for ended up dumping me over the telephone wouldn't give me a reason and refused to talk to me about it. She treated me like crap and now shes in a great relationship living with another guy really in love has a good job appearing that shes loving life. Then theres me who has had absolutely no luck, no girl has been interested in me in 3 years and to top it all off I have been having problems with a heart condition which in turn made me drop out of uni which has brought on clinical depression. Not just this all the bad guys I know seem to get all the luck, so many people I know who cheat on girls treat them like crap seem to have girls falling at their feet in love with them like one of my friends cheated on this girl with her best friend for about a year then when she found out he then chose her friend over her but then changed his mind and got her back, now they are rediculously in love and are getting married next month. I allways get the "your so sweet" tag but no girls want me really. I know there are 1000s of people worse off than me in the world but I am 23 and my life just seems so stagnant at the moment like its going nowhere and all the people in world that have treated me badly seem to having the perfect life. Everyone else is finding there soulmates and settling down for the rest of their lifes and I am just seeming to be left behind. Does life get better at any point???