Have I got a mental illness? I've had these symptoms for 2/3 years. Just need an opinion.?

Seasonal affective disorder ( I get Depression from September to March)
feeling irritable- Yes
feelings of despair- Yes
feelings of guilt and worthlessness- Yes
low self-esteem- Yes
indecisiveness- Yes
tearfulness- Yes
feeling stressed or anxious- Yes
a reduced sex drive- Yes
In addition to the above symptoms you may also:
vlbe less active than normal
feel tired and sleep more than normal (hypersomnia) Yes
feel lethargic (lack energy) Yes
find it difficult to concentrate Yes
have an increased appetite and eat more than usual (hyperphagia) Yes ( gained weight)

Borderline personality disorder

emotional instability (a psychological term for this is affective dysregulation) Yes
disturbed patterns of thinking or perception (psychological terms for these are cognitive or perceptual distortions)
impulsive behaviour- Yes
intense but unstable relationships with others- Yes can be.
Need to self harm- Yes

During a period of depression, your symptoms may include:
feeling sad and hopeless- Yes
lacking energy- Yes
difficulty concentrating and remembering things- Yes
loss of interest in everyday activities- Yes
feelings of emptiness or worthlessness- Yes
feelings of guilt and despair- Yes
feeling pessimistic about everything- Yes
self-doubt- Yes
being delusional, having hallucinations and disturbed or illogical thinking- sometimes I need a reality check.
lack of appetite- no my appetite increases
difficulty sleeping- Yes
waking up early- Yes
suicidal thoughts- Yes

The manic phase of bipolar disorder may include:
feeling very happy, elated or overjoyed- Yes
talking very quickly- apparently sometimes I do
feeling full of energy- Yes
feeling self-important- Yes
feeling full of great new ideas and having important plans- Yes
being easily distracted- Yes
being easily irritated or agitated- Yes
being delusional, having hallucinations - No.
The happy mood lasts from minutes to days whereas the depression lasts secounds to months. My anger can last days.