If you do, quit..it ages skin. If you are stressed, try to relax. Do you know if you crease your forehead while on the computer or looking at anything bright?
If you do, wear some shades. Use a moisturizer before going to bed and after showering. Rain or shine and in winter...always wear sunscreen and sunglasses outside or when your next to a window.
When your 25 yrs old... you'll be glad you always wore sunscreen and shades.