It was not your choice to be born, you did not have any choice, its Allah who decides who he creates and who he doesn't. As for your problems they're a trial and a test Allah gave you to see if you'll still be a grateful servant. You're not the first or the last to go through such trials, prophets had to go through this as well like Ayub who was afflicted with loss of wealth, family and was sick for over 15+ years.
As Muslims we accept that Allah created us to worship him no matter what problems we have. Thinking negatively about Allah will have a negative impact on you as Allah says "I am as my servant thinks of me." So think positively and in a good way about Allah and ask him to lift your struggles. No thorn hurts a Muslim except that it'll be penance and through which the believer gets rewarded by Allah.
Don't loose hope in Allah and supplicate to him sincerely.