What should I do? Am I overreacting?

Lately somehow I've been feeling hopeless and just like a week ago I was about to faint (it was like 3am) due to dizziness, nausea and I felt my head spinning and everything went dark for some minutes, my doctor said I should go get a heart check up because ever since I was young I was said to have a whole in my heart!! I feel like nothing and at the same time I feel every emotion rise through my body!! I have weird habits that keep causing me problems with my skin and I mean I bite , scratch or pinch my skin till it gets dark or rough/hard whenever I feel anxious, scared, panicked or even when I have to focus or think about anything, this got to the point where even my own mother keeps going crazy on me saying I'm crazy and I need therapy!! I also get worried sm about everyone and have been feeling extra sentimental, sensitive or irritated. I know shit went down when all of my comfort people are not here now and I feel quiet alone. I feel like there's no point and that I'm alone, I tried to stop from SH myself again and succeed in a way but everytime I take a look at my arms and see the visible scars of my doings it kind of makes me breakdown and hate myself more!! I've been overthinking everything to the point where I don't know what do I do with my life! I just wanted to have someone to talk to or consult me at times but I feel like asking my parents for it, is an overreaction because my "problems" are nothing compared to others when they got through them without help!!
What should I do? Am I overreacting?
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