I'm sorry to hear about your loss. It's entirely understandable that attending a funeral can be expensive, and sometimes circumstances beyond our control prevent us from being there in person. It's essential to remember that everyone's situation is unique, and it's not uncommon for people to face financial constraints, especially when it comes to unexpected expenses like travel for a funeral.
Feeling guilty in such situations is a common emotional response, but it's important to recognize that guilt may not be warranted. Instead, focus on honoring your aunt's memory in your own way. You can consider other means of expressing your condolences and supporting your family during this difficult time, such as sending a heartfelt message, making a phone call, or sending flowers.
It's also worth discussing your situation with your family members. They may understand your circumstances and be supportive of your decision. If possible, perhaps you can plan a visit to your family later on when it is more financially feasible.
Remember, grieving is a personal process, and there is no one "right" way to cope with loss. Do what feels right for you and your situation, and don't be too hard on yourself if attending the funeral is not possible at this time.