My palm hand always sweaty, could i have a heart problem?

No, you are either in hot weather, or your plans sweat when you are nervous. You body is talking to you, take good notes and share with your dr.

At age 21, your fear of "heart problem" likely needs to be addressed by counseling. Sweaty palms are not a sign of impending cardiac issues.

Sweaty palms are not due to cardiac issues, More likely there is some autonomic dysfunction which is causing excessive sweat gland stimulation. A dermatologist should be able to help you with this matter I prescribing an appropriate treatment.