You shouldn't be gambling due to influence from friends.
Good point here. You are right. Alot of people also gamble out of friends influence. I could remember I joined a gambling group where people uses huge money to gamble. Someone joined the group as well and said "where are mine going to start as I don't have huge money like people in here". I later advice him to start with the little he has. You shouldn't compare yourself with anyone as you don't know how much he/she earn monthly. Your salary may be his/her pocket money. Then why trying to imitate him/her in gambling.
If you start comparing yourself to others, that's when you will feel pressure to spend as much as you can. You should consider your financial capability before thinking of going after your peers. At the end of the day, they won't be responsible on your bills. Your head will also go crazy if you start thinking of the money your friends have vs your money. Should not in any way approach your situation like this. You need to take care of your own business so to speak.
Do remember this famous internet meme in gambling. For sure, you are very happy with your friends when you are just about to enter the casino, but more then likely, you will be in this mood if you go home as broke because you spent all your money..So know your limits!
https://twitter.com/gambling_memes