Is it normal to feel a bunch of bumps when you press on your armpit? are these lymph nodes?

Nodes: Nodes in the armpit area (aka axillary nodes) are commonly found. When these are small they are often referred to by MDs as shottyy nodes; see http://www.medterms.com/script/main/art.asp?articlekey=9902 Axillary nodes are common due to use of anti-perspirants which may cause nodes to increase in size and number. The key issue is is/are the node(s) increasing in size.