Transmission problem
1998 Opel Astra 6 cyl Manual 198000 miles

Hi there Please can you help? My car is making a sort of crunching noise almost like something is about to break but this only happens when first or second gear is selected, but it is fine when the third, fourth or fifth gears are selected. Also every time that I turn after selecting first or second gear it makes a horrible crunching noise! I am not mechanically minded in any way hence do not know what it could be, its taking off fine, and does rattle a little when in neutral but ince clutch is in then the rattling sound dissapears! Pls help and thank you!