Why do I feel bad when someone does something nice for me, specially if they buy me gifts?

It sounds like you don't have any self-esteem, which is probably the reason why you feel guilty when people treat you with things. Look at positive and self love affirmations, they'll help you. Don't worry, you can get better at this, you just have to practice loving yourself in order to raise your self esteem

Many people feel that way. It might be because maybe you don't feel as if you deserve them. But you do. Be grateful for the things you get because you're an amazing person.

I used to feel this way too, like I don’t deserve nice things, and through therapy I found that it was because of my low self worth and self esteem. I’ve been struggling with this for a long time and the super cliche advice “just love yourself” doesn’t help. What really helped my self esteem and self worth is taking care of myself, and most importantly making others around me feel loved and happy. When you realize you have the power to make others feel good about themselves, and use it, you will start to feel good about yourself too.

Many emotions such as embarrassment, guilt and anxiety can be experienced when receiving a gift. Embarrassment could be linked to anxiety. You may feel stressed that you will not like the gift and you will hurt the other persons feeling. You may feel guilty due to feeling like you are not worthy of a gift. However, you are worth it and the person who bought it wants to show you that you are an important person in their life.

There might be different reasons for that. It might be that I do not trust this person enough to receive gifts or good deeds from him/her, maybe that person hurt me before so I feel confused about the situation now, or even if that is not the case I don't want to have to return the favour to that person. It might be even the case of feeling guilty if I know I hurt that person in the past. As I said there might be plenty of reasons to feel bad feelings when receiving a gift or good deed.

I hear you, honestly I do to. For me personally it’s because I’ve been brought up to believe that gifts mean that you have done something calling for a person to spend their money on you. The part where I feel guilty is when people spend money on me for things that I have no control over, like holidays and my birthday. It’s just weird.

You probably feel a little guilty because you're unable to do the same, or you don't feel that you deserved the gift or that the person spent their time and energy in a way that may be costly.

I think because there tends to be a feeling of obligation to return the favour at some point which puts pressure and expectation on ourselves.

Sometimes, yes, but it depends on who it is that is buying me something and what they are buying me. For example, a coworker and I have an agreement that we take turns buying each other lunch, so whenever we go out we know whose turn it is to buy. On the other hand, when I am given an unexpected gift from someone, such as a friend or coworker, I feel like I do owe them something in return. As long as the purchase is justified I am happy and take it guilt-free, but I do believe in returning the favor as often as possible.

Sometimes I feel bad when someone does something good for me like when they buy me gifts because I feel like I don't deserve those kind actions. I also feel bad because I sometimes feel like I cannot reciprocate the same action with the same measure. Especially if the action costed a fortune for example if a friend stayed with me when I was sick. In addition to all that, I sometimes feel bad when a person does something nice to me because I will forever owe that person and nothing that I could ever do could ever convince me that I have fully paid the debt.