Exactly.

There are two issues that are not really related.

1) There is a deep issue with you. It was called mysterious for a reason, so, it is deep. No doubt about it. Since it is deep, it will need TIME to get resolved.

2) There is a fairly shallow issue with your behavior. Accepting and acknowledging compliments with grace and gratitude are part of being a civilized adult. So this is a must - it is not optional. In your mind, you are free to think any kind of thought. When you are being complimented, you are free to suspect ulterior motives, drunkenness, etc. You should not try to control your thoughts at this moment. But OUTWARDLY, you should be polite. So, as liveforfish suggested, starting by saying "thank you". Then, in baby steps, add a smile. Etc. You will get there. And this can be done pretty soon, without waiting for having all the mysteries solved.