I often get sensations like bugs are crawling on me. mostly on my legs and feet. should i be concerend about this?

Yes: This can be a sign of neuropathy which has many causes, I would make sure you get an exam to look at your B12, your spine, lyme test, thyroid, sugar to name a few.

See physician: Sensations like these are called dysesthesias. They can be due to a neuropathy; sometimes to a severe vitamin deficiency. The solution is to get a thorough evaluation by your physician. You need to know what medical problems exist and what treatment is required.