I think being what is currently regarded as attractive does usually give people advantages in life. But I also don't think it's the be-all and end-all, and that genuine talent will shine through. In the same way, being physically attractive is not a panacea against pain or failure.
I used to work as a model agent, and my models had just the same kind of problems as anyone else - their partners cheated, they had bad hair or skin days (more of a crisis for them than most), they lost their jobs, people bitched about them... you deal with all the same kind of problems as everyone else, even if you are exceptionally pretty.
Research does show people are inclined to give pretty people initial opportunities faster than ugly people. However, it also suggests that if pretty people let someone down, they are judged particularly harshly. What this seems to suggest is that good looks get your foot in the door, but you have to work harder to keep your place.
This doesn't mean less attractive people never get opportunities. Sometimes being less conventionally attractive allows people to be particularly blown away by your talent because they had lower expectations in the first place.
See: Susan Boyle. A great singer, yes. Exceptional? Not really. But she blew everyone away because they wrote her off as a dowdy spinster, and as everyone knows, dowdy spinsters do not sing like angels.
I'm pretty smart and pretty attractive (but neither Einstein nor supermodel), and I think this balance has allowed me to get opportunities and hold onto them in a way that might not have happened if I lacked one or the other quality. However this doesn't mean I have had a trouble-free life. I do consider myself very blessed in many respects. Yet there are still things I wish I had, that others less smart or pretty than I do have.
To conclude. If music is your passion, follow it. Your looks will not make or break you. Your determination will.