Why cant i lose weight? So fustrated! )-:?

im 21 ,F, 115-116 pounds 5’5. I went from 130 to 120 pretty easily and the other 5 pounds just flew off with the right vitimins and not even that much excersise and a pretty free diet. So why is my body suddenly really relunctant to go down. Weight loss is real slow…..Do i now need to start starving myself?
i hardly drink, run at least twice a week, and eat fairly well in my opinion lol i think…im a biomed student.

Lose weight while preparing for an important exam?

I have a very hard professional exam in a month, so obviously my primary mission is studying. But at the same time I’d like to lose some weight. What I’m worrying about is that if I go on a diet, it’s not be good for my brain; thus poor concentration and lack of energy may be some serious consequences.
I am not fat at all, yet I look strong, athletic… My current diet is pretty healthy, I think. I don’t normally eat meat, even though I am not a vegetarian. I must eat lots of veggies and fruits everyday, and drink a lot of tea or water. No snacks. And I am extremely picky on how much calories my food has; go with low-fat/fat-free food always. Plus, I work out like around 3 times a week, 40 minutes each time on treadmill.
I have been doing this since the past 3 months when I was in college. I feel tired easily, is it because of my diet? Now I really need a healthier weight loss plan which can provides me with enough energy while I am preparing for the exam.

Aiming at losing 5-8 pounds in one month.
I am a female, 20-year-old, 175cm in height, 140 pounds.

how can I change my diet and will this workout program help me lose weight?

I had my 27th birthday today and placed my life into retrospect. This is going to be a quite detailed entry of things about me and diet stuff.

From age 16-21 I skateboarded everyday and never less than 4 hours. Doing tricks mainly but also skating around bikepaths, roads..etc. My body weight was at 185-195 then. I had a good body just never ‘worked out’ with weights or anything to achieve a 6 pack or larger arms/legs.. skateboarding that all for me… besides the abs they were flat but not defined.

I had quit smoking cigarettes with the help of Chantix (best pill ever) but it seems I quit skateboarding at that time also. I had noticed doing it less and less, so from age 22-25 I quit skateboarding. When I was 24 I started truck driving and got really fat. I weighed 275 lbs. After weighing myself and having a total meltdown about my weight I quit driving trucks.

I was super depressed and started rollerblading on bike path, and walking. I even started to ride my skateboard again but would tire from long distances. I was able to drop down to 230 easily. I would say in a month or two. The next year, I became vegetarian with my girlfriend and over the course of a summer I went from 230 to 220. So not much difference from not eating meat.

I weighed myself today at 240 and am ready to change my body. Right now my diet isnt the best. I normally drink 4 cokes a day, or maybe a few red bulls. Late at night I find myself snacking out. Over the past few nights instead of eating junk I would eat a banana and almonds. It worked for two nights in a row, but last night I ate 2 donuts. I need to know what I can eat late at night, or even to snack on to help lose weight. Are bananas, apples and almonds/nuts good? What about peanut butter?

Over the past 2 months I’ve been skating 3-4x a week never less than 3 hours. I have a warehouse I rent that I can skate in during the cold.

I’m thinking about using this total gym xls my father owns and do:
curls
chest flies
seated rows
kneeling rows

and then also doing squats when im off the machine. I think holding a total of two 40lb free weighs while I do squats might help over normal no weighted squats. I dont know.. i know nothing about the traditional ‘workout’.

So what else can I do to lose weight quickly? I’m tired of being a fatass. I feel like a fatass but my ex’s always say… no you look good your stomach isnt even bad. It seems most of my weight is around my stomach and hips.

Should I alternate days? M,W,F,Su be skateboarding, and T TH Sa for total gym/squats?

please help me change my life. Ive been sleeping alot and i think its because im depressed about my weight
i dont know if i can jog that long. i jog for half a mile and my legs are on fire lol