Before I learnt phonetics, my pronunciation was suckish. But ever since I've learnt phonetics, I've been able to pronounce the words I wasn't able to. Plus, I do have my own accents. (When I go traveling in my own country, people are always asking me if I'm from US or overseas. one of my friend said my accent is weird, though.neither like american nor british accent. but I don't care!) Well, I bet you could speak like American or British speaker if you lived in US or UK for more than 4 years. Well, no matter if you can speak like native speaker or not, learning phonetics doesn't harm you at all. Do have a faith in yourself. Good luck!