everyone gets sore bro, i usually see it as a sign you need to stretch it out and enhance warm-downs etc. or a sign you are not eating enougth...not a sign of growth...you can train though soreness, but id not train a muscle like legs if your aching real bad, i doubt you are fully recovered if thats the case, active recovery is great if you are sore the next day..i prefer to swim if im not ready to hit the weights, its improves flexibility ad get you pumped without over doing it, keeps you supple too.....aching is natural, you sound like you are doing okay so keep doing it....just make sure you lug a shake post workout, it helps, cold showers and sports massages all work well too....