I am a 23yrs old female.I am very skinny and it becomes very difficult for me to gain weight.My BMI is very low.How can I gain weight?

there are various reason  for a person to be skinny like their diet genetics etc but anybody can turn from skinny to fit just by changing their diet first increase your calories intake accompanied by little excercise . instead of eating 3 big meals per day try to eat litle bit every hour (this trick is used by actors and models) eat food which are rich in calories like potato,rice,brown bread,milk,peanut butter etc. for further querries dm me on insta @ mrsingh369

Hello Kajal!
Hope you are in the pink of your health.  
As you want to gain, start following a diet in surplus. Don't go in extreme surplus, create an intake plan in excess according to your body's needs. Eat clean food. Gaining doesn't mean munching on everything you find.
With a structured surplus, diet follows a properly structured workout. The workout must consist of resistance training.
This combination will help you get your lady curves as well as look healthy and gain some lean mass as well. You won't look masculine.

1. Overcome The Anxiety Of Being Skinny. ...
2. Challenge Yourself Each Time You Work Out. ...
3. Eat Big, But Clean. ...
4. Water, Water, Water. ...
5. Stay Focused On the Task At Hand. ...
6. Focus On Compound Lifts. ...
7. Aim for a gram of protein per pound of your body weight every day. So if you weigh 180 pounds, eat 180 grams. Take in starchy carbs like potatoes, rice, and oats; and snack on high-calorie (but healthy) foods like nuts, seeds, and other sources of good fats.

Dear Friend,

Firstly, Do not worry. Skinny girls look most beautiful. So, Be confident and do not care about people who judge others based on how one looks. All that matters is if you are in good health.

Some tips for healthy lifestyle:

1) Eat fresh fruits, vegetables, dry fruits and ghee regularly.

2) Chew well while eating your meals. Do not gulp.

3) Drink 6 - 12 glasses of water (as per your capacity)

4) Perform surya-namaskar everyday - 3-12 times/day (or as per your capacity).

5) Peform these yogasanas regularly to improve physique: 

Ustrasana , Bhujangasana, Gowmukhasana, Dwikonasana, Dhanurasana and Vrikshasana - Google it :)

6) Most important! Do not carry tensions in your head. Maintain emotional well-being. Be around friends and family who love you unconditionally and support you. Love yourself. Pamper yourself.

7) Sleep by 10 PM and wake up before 6 AM. Minimum 6-8 hours of sleep is necessary (depending on nature of your work everyday)

God bless you!