As other have said, it look like bike fit might be the biggest issue. Is the bike too small? If so I would not spend any more money on it and just keep riding and saving for a proper fitting bike. You could do some things to lighten up this bike, but it's probably not going to be worth the money if it's too small. Sounds like for your commute you would be better of on a more pavement oriented bike, maybe even a cross type of bike. Something that can handle larger tires and fenders if you want to start riding in the rain. You can find both flat bar and drop bar bikes that can work. I'd also avoid front suspension, it just adds more weight.