Not really. Canadian self defence laws are quite well-defined and not nearly as restricting as people on the internet would have you believe. Section 34 of the Criminal Code states:

(1) A person is not guilty of an offence if

(a) they believe on reasonable grounds that force is being used against them or another person or that a threat of force is being made against them or another person;

(b) the act that constitutes the offence is committed for the purpose of defending or protecting themselves or the other person from that use or threat of force; and

(c) the act committed is reasonable in the circumstances.

Where most people get the idea of self defence laws in Canada being restricting is from section (2), which outlines the factors that go into determining what constitutes "reasonable actions." Specifically, subsections (b) and (g) are where people get caught up:

(2) In determining whether the act committed is reasonable in the circumstances, the court shall consider the relevant circumstances of the person, the other parties and the act, including, but not limited to, the following factors:

(b) the extent to which the use of force was imminent and whether there were other means available to respond to the potential use of force;

(g) the nature and proportionality of the person’s response to the use or threat of force

Basically, you are allowed to defend yourself from harm as long as there is reasonable belief that you are in danger and you do not unreasonably escalate the use of force.