Jennifer Lawrence says she is ''constantly waiting for everything to fall apart.''

The 24-year-old actress, who won an Oscar for Best Actress last year, admits she doesn't think her success will last forever.

Asked if she thinks she could start ''phoning it in'' or retire early because she has already achieved so much, the 'Hunger Games' star: ''I feel like it's going to happen for me, I just have this [feeling]... so I feel like I don't have to do that. I'm constantly waiting for everything to fall apart.

''Every time my phone rings I'm like, 'It's over!' ''

Jennifer jokingly told Stephen Colbert on the 'Colbert Report' that she's planning on ''going postal'' in the future and said her reputation as ''a nice, normal person'' is only ''for now.''

When Colbert suggested they plan her ''downward spiral'' and asked her to ''pick the drug and crime,'' suggesting Crystal Meth, she quipped: ''Ooh. [It's] bad for the skin!''

The blonde beauty also laughed off suggestions she is like her character Katniss Everdeen because she grew up in Kentucky.

She said : ''I've never volunteered for anything in my life.

''I grew up in Kentucky -- not skinning squirrels. Actually, I have skinned a squirrel before. I can't even say that.... I was like, 'Jennifer, you've even eaten squirrel chili!' ''

The blonde beauty, who is rumoured to have rekindled her romance with Chris Martin following their split last month, also revealed she has no problem being called ''J Law'' by her fans.

She said: ''I don't mind it. It's actually been my nickname since elementary school, weirdly, maybe not elementary school but like middle school to be exact.''