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How to determine if I'm under the attack of DDoS?

Hello!
How to determine if I'm under the attack of DDoS?
Considering I'm using Linux 18.04 Ubuntu operating system, running a gaming server on it with 200 players daily, yet some people experience heavy rubberbanding;
The internet speed is 1GBit/s, and tcpdump shows;
49151 packets captured
101057 packets received by filter
51895 packets dropped by kernel

What are these "dropped" packets? I've read that increasing buffer size of tcpdump would be necessary to use, if you have dropped packets, yet I cannot understand exactly what does tcpdump mean by 'dropped' packets. Host says that I am experiencing 1.99Gbit/s DDoS attack, but I don't really believe them.

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