গান গাওয়া Lessons

I'm the same as you, I প্রণয় গান গাওয়া and I'm neh... well, I want to improve but I do know that গান গাওয়া lessons can make a definate improvement on your voice- even though it can take a long time- and I suggest that আপনি do get lessons if আপনি want to improve.
I don't know about lessons on the internet, I don't think they would be as good as ACTUALLY having someone there to listen and help you, and also, having someone there would boost your confidence if আপনি ever wanted to perform professionally.
I personally, would say go for ACTUAL গান গাওয়া lessons but they are really expensive (or so I've heard), so unless আপনি অথবা your parents mind spending quit a bit of money, go for real lessons.