People vary a lot in their capacity to achieve a good pronunciation of a new language. Embarrassment and anxiety about this can often make things even worse. This can lead to avoidance of situations where you have to speak, and so you rarely get the opportunity to practice. You need to look for situations or courses where you feel safe and less threatened. As you start to feel more comfortable, you will start to communicate in a more natural way more and your pronunciation will gradually improve.
An accent is part of a person’s identity and should be respected. It simply reveals your cultural background and so is not something to be ashamed of.