There are people that have grown up playing poker and others that are very new to playing. Some just play at home for fun and others play for money. There are people that think that those who win often are lucky because they get dealt good cards.
It is important to remember that there is a lot of skill in playing a good game of poker. You need to know what the best thing to do with your hand, to start with. Think about which cards to swap and what your chances are of getting a good hand that could win the game. Then you have to decide how much money to gamble and whether you think it is worth very much and try to guess whether everyone else has a good hand or whether they are bluffing. You also have to hide what is in your hand so that the other players do not know. There are actually a lot of skills that you need to play.
If you have played for a long time, you will have picked up these skills without necessarily knowing it and so may not realise how much is actually going on in your head when you are playing as it may just come automatically. If you are new to playing, you may not realise how many skills are required.
If you are not having much success with playing poker then it is a good idea to try to improve your skills. You need to find material online or in a book which will explain to you what you need to do to be able to win and how you can get those skills yourself. It will take practice and you may have to put a lot of time in to it. However, winning can make the game a lot more fun and so it is worth having a go at learning more so that you can have a better chance of winning.